1. Fifth Wheel King Pin
  2. Reese
  3. Lippert 1621
  4. Upgraded Pin Box
  5. 16000 lbs GTW
  6. Absorbs Road Shock and Reduces Chucking
5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity

5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity

Item # 5AB-E1621-16K
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Fifth Wheel King Pin
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Shipping Weight: 104 lbs
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Reese Fifth Wheel King Pin - 5AB-E1621-16K
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The 5th Airborne premium fifth wheel air-ride extended pin box coupler acts as a buffer between the tow vehicle and the trailer, minimizing the abuse sustained from turbulence on the road and giving you the smoothest ride possible by reducing shock. Call 800-298-1624 to order Reese fifth wheel king pin part number 5AB-E1621-16K or order online at etrailer.com. Free expert support on all Reese products. Guaranteed Lowest Price and Fastest Shipping for 5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity. Fifth Wheel King Pin reviews from real customers.
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  • Reviews (75)
  • Q & A (125)
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  • Why etrailer?

Reese Fifth Wheel King Pin - 5AB-E1621-16K

  • Lippert 1621
  • Reese
  • Upgraded Pin Box
  • 16000 lbs GTW
  • Absorbs Road Shock and Reduces Chucking
  • Fixed Turret

The 5th Airborne premium fifth wheel air-ride extended pin box coupler acts as a buffer between the tow vehicle and the trailer, minimizing the abuse sustained from turbulence on the road and giving you the smoothest ride possible by reducing shock.


Features:

  • Pre-assembled for quick and easy installation
  • Bolts onto trailer using existing holes and hardware
  • Cushions shock with adjustable air spring and shock absorber
    • Reduces longitudinal shock (chucking) by nearly 60%
    • Decreases vertical shock by 44%
    • Relieves stress on coach frame
    • Reduces vibration inside coach and protects contents
    • Smoother ride means less fatigue for driver and passengers
  • Air spring is enclosed within the coupler for protection against the elements
  • Pin box has built-in friction-sway control
  • Streamlined, aerodynamic design


Specs:

  • Capacity: 16,000 lbs; CSA approved
  • 3-Year limited warranty
  • Designed for use with the following pin boxes:
    • Lippert 1621 (15.5K Pin Box)



Note: It is recommended that if sitting idle for more than a week, the air springs should be drained to relieve pressure on the system.


Fifth Airborne diagram

5th Airborne Premium Fifth Wheel Air-Ride Coupler
1. Rear mounted, heavy-duty shock absorber
2. Enclosed air spring also absorbs shock
3. King pin - connects to the fifth wheel trailer hitch in the truck bed
4. Pivot point - allows king pin to move up and down





5AB-E1621-16K 5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity

Installation Details 5AB-E1621-16K Installation instructions


California residents: click here



Customer Reviews

5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity - 5AB-E1621-16K

Average Customer Rating:  4.7 out of 5 stars   (75 Customer Reviews)

The 5th Airborne premium fifth wheel air-ride extended pin box coupler acts as a buffer between the tow vehicle and the trailer, minimizing the abuse sustained from turbulence on the road and giving you the smoothest ride possible by reducing shock.

- 5AB-E1621-16K
by:

Was easy to install on our 40' 5th wheel. Have towed over 4000 miles with no problems. Keep the proper amount of air in it and it makes towing a whole lot better


Comments
Still working, no problems after another 3000+ miles. Excellent pin box.
Lenny D - 02/09/2021


- 5AB-E1621-16K
by:

We just recently were able to take the 5th wheel out for a trip after installing the air ride coupler. Our ride was soooo much better, no more jerking in the cab and things bouncing round in the trailer. So glad that we made the purchase.


Comments
Still love it! So glad that we purchased it.
Calvin D - 03/31/2016



- 5AB-E1621-16K
by:

This Airborne Kingpin box works great! Our hitch location in second-hand truck seems located in less than ideal position. This resulted in lots of "bucking & chucking" but Air-ride has changed it to gentle float at worse. Great product at fair price!



- 5AB-E1621-16K
by:

5 stars on etrailers business model This is a bit dirty but that is one year in Florida



- 5AB-E1621-16K
by:

I received this just in time to install on our Reflection 303RLS before our winter trip to Bosque del Apache in New Mexico. Installation wasn't too difficult; I mainly did it myself with a little help from my wife and a lot of help from a hydraulic jack in my truck bed to hold one end in place. I tested it out on a short 15 mile tow with my Ford F250 and adjusted the air bag position and air pressure around 100 psi to get a nice ride. Now, after towing over 2000 miles of highways of varying quality, I can definitely report that the ride has been improved substantially. Also, I did not have to add any air over two full days of towing in each direction, so earlier leak problems seem to have been solved. Just to clarify, my ride problem has always been up and down motion on uneven road surfaces, even on some interstates with bumpy lanes due to heavy truck traffic. I never experienced "chucking" problems, either with the old Lippert kingpin box or this new Reese Airborne box. With the improved ride that I experienced on this most recent trip, I am much more relaxed when driving these bumpy or wavy roads, and my wife is much happier not to hear my grumbling about poor highway maintenance!



- 5AB-E1621-16K
by:

Easy to install & works great



- 5AB-E1621-16K
by:

I had a Fabex 5th airborne hitch pin on my other 5th wheel and was very pleased. Bought new 5th wheel and put on Reese 5th airborne hitch pin expecting the same performance, but the Reese does not perform as well as the old one. I have tried different air pressure and different air bag positions but cannot not find the smoothness I had with the old one. Also, I have had to touch up paint because of rust causing the paint to chip and come loose in certain areas. Just wish I could give it a better review.


Comments
I am sorry to say that I am not happy with this product. Although it is only one year old the paint has faded and it looks much older. I continue to touch up, have tried waxing it but believe at some point I will have to replace with another brand or re- paint. Guess I just got a bad one.
djmc - 11/19/2017



- 5AB-E1621-16K
by:

This pin box made a tremendous difference in my fifth wheel trailer. With the original pin box, the trailer controlled the truck and now it is the other way around. Now instead of huge jerks on rough roads, I get cushioned bumps. I can look in the rear view mirror and see the pin box absorbing the bumps.


Comments
After a year, I still love this product. The best improvement I have made on my 5er.
Larry L - 08/29/2018



- 5AB-E1621-16K
by:

The air valve stem would not accept air. Replaced the valve core to correct the problem. Fiberglass fairing on LongHorn 5th wheel would not fit new king pin box as it is longer that the original one. Just finished about 3500 miles with this new King Pin box, finding the ride somewhat improved, especially on rough freeway often found going through big cities. Did installation myself by first pushing box onto hitch, then using truck positioning and trailer jacks, was able to get box into correct position. Later repeated the exercise to lower the box one row of bolt holes to better match original king pin height.



- 5AB-E1621-16K
by:

Read several reviews and decided to go with the Reese airborne. Have purchased from etrailer before and always had great service. Pin arrived in a week and the price was better than any place else.


Comments
Great, will not be without one
Mike F - 02/15/2018



- 5AB-E1621-16K
by:

Installed the airbourne & went for a ride.Definitely works well reducing the chucking between truck & trailer aswell as the up & down bounce.Had alittle trouble adding air to the bag but that might of been my air chuck.Packaging was damaged,torn box but the product was ok after inspection.I read a question from another buyer whether to add the req.air before or after the trailer is on the truck.Your tech. advised to add air first before hitching trailer to truck then reduce pressure as req.which helped me with the set-up. It's the end of the camping season so I will have to wait until next summer to try it somemore,otherwise very satisfied at this point. Greg C.



- 5AB-E1621-16K
by:

My hitch arrive much quicker than promised. Though I am 70 years old, I had no problem installing alone. I worked off the tailgate of my truck with a bottle jack and some blocks of wood. Thanks for the best price and great shipping.


Comments
After a year and thousands of miles, I would not want to tow without it. The sweet spot for my 2007 cedar creek 34sats towed by 2500 dodge ram, is 85 lbs air.
james d - 01/18/2015



- 5AB-E1621-16K
by:

The 5th wheel airborne king pin was straight forward to install. The product did help with the trailer chucking by absorbing some of the bounce. I did have a problem with the first time I used it with the bladder not holding air. Called customer service and had me test the inner air valve and it turned to be a bad valve, replaced it and it now works properly. I believe that the valve problem was caused by cold weather as it was 10 degrees below zero when we I tried to fill the bladder to leave on our trip to warmer weather. I am still trying to work on the amount of air to inflate the bladder to give the optimum ride. I recommend the product.



- 5AB-E1621-16K
by:

Air fill valve was damaged in shipment ( as mentioned in many reviews). Etrailer had mfg send a new one overnight. I suggest that you ship with the fill valve not installed, having the customer install it when attaching to 5th wheel. Mfg sticker specifies that the attaching bolts be torqued to 200 ft. Lbs. Had to rent a torque wrench to install, thanks to my nephew, he was able to to apply enough pressure to achieve that setting. Hard for an old retired person to exert that much force. Now the good stuff. We traveled from California to New York. By the time we got there, my back was in bad shape due to the severe chucking. Ordered the pin box to be delivered to one of our Campground stops. We're now half way home, and my back is not hurting at all. Chucking is gone, great product!



- 5AB-E1621-16K
by:

I bought the Reese fifth wheel king pin for a upgrade to the factory one. It was easy to install. What a big difference it made. After some adjustments, as per the instructions, no more chugging or very little. Now enjoy traveling with the Fifth wheel.


Comments
Still enjoying the Reese fifth wheel kingpin. When we are done for the season I let the air out of the airbag and refill in the spring. Has a little bit of surface rust on it. Will sand and paint. Still a great product.
Marie W - 10/05/2017



- 5AB-E1621-16K
by:

I ordered it and had it within a week. Installed the very same day and boy was I suprised how well it worked. Every 5th wheel should have one. You do not know it is even back there. I recommend e-trailer for all your trailer needs. And also it was extremely easy to install, less than 30 minutes I was done. Awesome product. Thanks E-Trailer!!!!!!


Comments
All I can say is that it is just as awesome now as it was when I first got it. Thanks E - Trailer!!!!!
Shannon C - 07/10/2014


- 5AB-E1621-16K
by:

I purchased this based on price and reviews I read. Definitely helps with the ride! Alot less bucking and chucking over dips and bridge crossings. I did have to do a bit of tinkering with air pressure in the bag and location of the bag to get the ride right. This is the reason I didn't give it 5 stars. Access to the lower air bag bolts are a pain to get at. Luckily I'm an auto technician and have a wide variety of tools to do it. I don't know how anyone would do this with a basic rachet without a flex head. If Reese ever redesigns this pin box they should add some access holes to the bottom for this adjustment. Only other issue is small.....the pin box interferes with my b&w release pin. Not a big deal, just have to put the lock pin in upside down. This box extends further past the pin



- 5AB-E1621-16K
by:

Very well made pin box. Only had it on my 5th wheel for a month & traded the rig for a new 2017 fiver. It worked GREAT for the two trips we had it on the trailer. I removed this Reese pin box thinking that I may use it on my new rig, but the new fiver came with a similar air suspension box, so this one has been sitting in my garage for 10 months. Anyone want a “like new” Reese air ride pin box for $400.00, please let me know.



- 5AB-E1621-16K
by:

The Reese 5th Airborne pin box made the ride so much smoother then al the chucking me bouncing I had before. The order arrived quickly and was easy to install. Minor damage to the air stem in shipping that was no fault of etrailer, but was able to air up the bladder. Great investment for a smoother ride.



- 5AB-E1621-16K
by:

I pull a 34’ Reflection 5th wheel that is within the rated towing capacity for my 3/4 ton GMC, although I noticed it would bottom out when I went over abrupt bumps at highway speed. I added rear stiffeners to help that issue, but wanted to soften up the effect on the trailer by adding a cushioned pin box. I decided on the 5th Airborne to provide that softening effect. After a year in service I’ve noticed a big improvement in the ride, while the bouncing of the trailer is greatly reduced. The pin box was light enough for easy installation, while tough enough for the service. I have over 5,000 miles on it now and it is still working perfectly.



- 5AB-E1621-16K
by:

So far so good. I did have to contact Reese hitch because air bag was leaking down. Reese sent me another air bag and everything seems good. I put in 80psi when we travel and it seems to do a good job. Takes some back in forth out plus bounce. etrailer has always done me right. Thanks etrailer



- 5AB-E1621-16K
by:

After talking with at least 12 different campers that had this King Pin I decided to purchase one. I searched the web to find the best price and came across ETrailer which had the best price. I called and talked to Dana which was very helpful and I placed my order. The product arrived in 3 days and the packaging was terrific. I read the directions which were easy to follow and read some other reviews from people who had already installed theirs. Unable to find anyone to help me I ventured into installing it myself and was able to complete the project within an hour. It fit perfect without any modifications to my trailer or the King Pin. I have yet to tow my trailer but form all I have read and the easy installation I am sure I am going to enjoy a much smoother ride..I want to thank ETrailer and Dana in customer service.



- 5AB-E1621-16K
by:

My unit is 12000lbs loaded. Install is not difficult with 2 people. Ride much improved and NO chucking. I was also able too find the exact part number on [other website] and etrailer priced matched it %110, so I got a great deal on top of it.



- 5AB-E1621-16K
by:

Easy to install on my Jayco 26.5 BHS. It was exactly what I needed to work with my B&W companion fifth wheel plate. Rides great and was able to help with the height adjustment to get my camper more level while in tow. No chucking at all. I greatly appreciated the fast shipping too to get me on the road for my trip! Ordered on Tuesday received on Thursday!!



- 5AB-E1621-16K
by:

ITEM WAS EASY TO INSTALL. TOOK LESS THAN 1 HR TO INSTALL WITH HAND TOOLS. JUST GOT BACK FROM 4200 MILE TRIP . INSTALLING COUPLER ON 2013 CYCLONE TOYHAULER 15500 LBS GVW .MADE RIDE LIKE DAY AND NIGHT DIFFERENCE . WENT FROM AZ TO ILL TO MINN AND BACK . I WOULD NOT PULL ANOTHER TRL WITHOUT THIS TYPE OF COUPLER AGAIN, GREAT PRODUCT.


Comments
just got back from cal . still working great even on rough cal roads
TERRY G - 07/11/2016


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Ask the Experts about this Reese Fifth Wheel King Pin

  • Fifth Airborne Pin Box Replacement for 43 Dutchmen Voltage Toy Hauler
    Since your serial number start with 028 you have a Lippert 1621HD pin box. Since your trailer weighs 21k you'd need then the 21k 5th Airborne for the 1621HD pin box replacement part # 5AB-E1621-610. I attached an install video for this pin box for you to check out as well.
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  • Which 5th Airborne Cushioned Pin Box Fits 2018 Grand Design Solitude 310GK
    The correct 5th Airborne Premium Fifth Wheel Air Ride Coupler for your 2018 Grand Design Solitude 310GK is the # 5AB-E1621-16K since I was able to determine the pin box type your trailer has is a 1621 and the GVWR is 15k.
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  • Replacement Sidewinder Pin Box for 2021 Grand Design Reflection 303 RLS
    In order to determine which Reese 5th Airborne Sidewinder will fit on your 2021 Grand Design Reflection 303 RLS you will need to check the spec sticker on your existing pin box for a model number. The 5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity # 5AB-E1621-16K is designed to replace Lippert 1621 model pin box, so if you find that model is on your new trailer, this will be a good replacement and will work with your A16 hitch. If you find that you've got a...
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  • How and When To Adjust Air Bag Position in 5th Airborne Pin Box for 5th Wheel Trailer
    Sounds like you will want to move the air bag of the 5th Airborne Pin Box you have like part # 5AB-E1621-16K. I attached a picture that I took from the install instructions that covers how and when to make the adjustment. Typically if the pin weight is lighter you move the air bag towards the king pin or if it's heavier you move it the other way. If you check out the picture I attached you'll see how this is accomplished.
    view full answer...
    Image 1 for
  • Will Using a 5th Airborne Replacement Pin Box Raise the Height at the Front of a 5th Wheel Trailer
    The 5th Airborne replacement pin box # 5AB-E1621-16K should not raise (or lower) the height of the trailer. It basically has the same measurements as the stock pin box would have. Adjusting the air pressure and position of the air bag in the pin box could affect the ride height at the front of the trailer.
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  • Best Fifth Wheel Pin Box Replacement Recommendation for a Lippert 1621 Pin Box
    If you are looking for the best fifth wheel pin box to replace your Lippert 1621 that will provide the smoothest ride quality and won't break the bank I would recommend the new Trail Air Flex Air part # LC328492. This pin box works to fight and prevent vertical and horizontal chucking to provide you with a very smooth ride quality. I attached a demo video for more info. Since you have a short bed truck I believe the best option would be a Sidewinder Pin Box with a 5th Airborne Air Ride...
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  • Is Reese Revolution Pin Box Compatible With B&W Companion 5th Wheel Hitch
    The answer depends on which B&W Companion fifth wheel hitch you have; you never mentioned what truck you have or how the Companion is mounted so l'll use a 2019 Ford F-250 as an example. If you had the factory prep package in your truck, and your Companion was B&W Companion OEM 5th-Wheel Hitch for Ford Super Duty Prep Package # BWRVK3300, it would be compatible with your Reese Revolution (which is the OEM version of the Sidewinder) pin box. The same is true for all Companions that mount...
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  • Best Pin Box Upgrade for a Lippert 1621 on a Grand Design Reflection 303RLS
    The best replacement pin box for the Lippert 1621 on your Grand Design Reflection 303RLS is a 5th Airborne from Reese. These pin boxes have an adjustable air spring and shock absorber which will reduce the back and forth chucking (stopping and taking off) by 60% and lower the shock from bumps by 44%. This not only helps to give you a great towing experience, but it also helps to reduce the vibration inside the coach. When I looked up your Grand Design it looked like the GVWR was just...
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  • Replacing Existing Lippert 1621 King Pin Box With Air Ride Pin Box
    You can indeed use a sliding fifth wheel hitch with an air-ride pinbox like the Trailair or the 5th Airborne. To replace the Lippert 1621, we have four different models with differing capacities to choose from. Starting at 16K, we have the Reese Fifth Airborne # 5AB-E1621-16K. At 21K, we have the Reese Fifth Airborne # 5AB-E1621-610 or the Trailair # LC158778. At 18K, we have the Trailair Flex Air, part # LC328492. If 18K would provide enough capacity for you, I'd certainly recommend...
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  • What Pin Box Does 2018 Grand Design Reflection 150 Have
    Your 2018 Grand Design Reflection 150 has a Lippert 1621 style pivoting pin box which is the Sidewinder/Revolution part # RP34FR. If you wanted to replace that with the 5th Airborne part # 5AB-E1621-16K you mentioned this would be the correct fit. You lose the pivoting feature so for a version that includes that as well you'd want the # RP61422.
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  • Replacement Air Valve For 5th Airborne Premium Fifth Wheel Coupler
    If you need to replace the valve or repair a broken air line on your 5th Airborne Premium Fifth Wheel Air Ride Coupler, part # 5AB-E1621-16K, we have a repair kit designed to do the job. I recommend the Fifth Gear Easy Fill Retro Fill Kit, part # 58382. This is designed to fit both the 5AB-S and 5AB-E Pin Boxes, and provide easier access to the inflation valve.
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  • Will Upgrading 1621 Pin Box on 2017 Crusader Lite Allow 5th Wheel to Sit Level
    I reached out to my contact at Lippert who said that the correct pin box for your 2017 Crusader Lite is the 1621 # LC1191191. Although we do have replacement pin boxes and pin box upgrades, like the 5th Airborne Premium # 5AB-E1621-16K, I have a few things for you to check first. There are some adjustment holes on the wings of the pin box so you can try adjusting the height of the pin box. Most 5th wheel hitches have height adjustment options as well so that is something else you can...
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    Image 1 for
  • Comparison Between 5th Airborne and Trailair Flex Air 5th Wheel Air Ride Pin Boxes
    Generally speaking, the Trailair Flex Air and the 5th Airborne Fifth Wheel King Pins serve the same function. Both use shock absorbers and air bags to help isolate the tow vehicle from the road shocks experienced by the 5th wheel. This makes for a much smoother and more pleasant ride. However, the Trailair Flex Air goes a step further by allowing the king pin plate to pivot fore and aft. This helps further reduce chucking over and above what the Fifth Airborne does. Since you've towed...
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  • What is Correct Air Pressure for 5th Airborne Premium Fifth Wheel Air Ride Coupler # 5AB-E1621-16K
    The 5th Airborne Premium Fifth Wheel Air Ride Coupler, part # 5AB-E1621-16K, is a direct replacement pin box for the Lippert 1621 and is rated for king pin weights up to 4200-lbs. Air spring pressure can be adjusted between 80 psi and the maximum of 120 psi to achieve the smoothest ride. Add air if the ride is too soft; remove air if the ride is too stiff. A good starting point is about 90 psi. For reference I have linked the installation instructions for this pin box. I have also linked...
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  • Can a Cushioned Pin Box Be Used with the Demco Hijacker Autoslide on a 2018 Keystone Cougar 359 MBI
    The only type of pin box that you cannot use with the Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider part # DM8550022 that you have on your 2016 Chevrolet Silverado 2500 is one with a rotating turret. However, depending on which type of pin box you choose there may or may not be a capture plate that is needed. For a cushioned pin box that will reduce chucking and jarring, I recommend taking a look at the 5th Airborne Premium Fifth Wheel Air Ride Coupler. This pin box will...
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  • 5th Airborne Recommendation for a Mor/Ryde SPB-1621LD
    Both the 5th Airborne Premium Fifth Wheel Air Ride Coupler # 5AB-E1621-610 and # 5AB-E1621-16K would work on your Mor/Ryde with a 1621LD pin box. The main difference between these two is the weight capacity, and since the GVWR of your trailer is 12,000 lbs the # 5AB-E1621-16K would probably make more sense for you since it has more than enough capacity for you. I attached installation instructions, an install video and a review video for this product for you to check out also.
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  • Best Option to Improve Ride When Pulling Fifth Wheel Trailer With 2006 Dodge Ram 3500
    There are better options than a gooseneck adapter available for you to greatly improve your ride when towing your fifth wheel trailer with your 2006 Dodge Ram. I strongly recommend against installing a gooseneck hitch adapter and instead using an air ride, shock absorbing pin box. A great option for you would be the 5th Airborne Premium Fifth Wheel Air Ride Coupler # 5AB-E1621-16K, which is a replacement for your Lippert 1621 pin box and is designed to significantly reduce the amount...
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  • Sidewinder Pin Box Replacement Recommendation to Replace a Mor/Ryde SPB72-1621LD
    Based on the part number you gave for your Mor/Ryde pin box it sounds like you have a pin box based on the Lippert 1621 pin box. Which then for the correct Sidewinder you would want the part # RP34FR.
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  • Air Ride Pin Box Upgrade For 2019 Reflection 311BHS Fifth Wheel
    The Reese FifthAirborne replacement pin box you had looked at, part # 5AB-E1621-16K would work well for you. The air bag and shock absorber do a very good job of keeping the bouncing and shock from the fifth wheel from being transferred to the tow vehicle. The Lippert Flex Air, part # LC328492 takes it a step further by using a cushioned pivoting head that further resists the chucking (front to back motion) caused by acceleration and braking, for superior ride quality. There's a pretty...
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  • What Causes a 5th Airborne Premium Fifth Wheel Air Ride Coupler To Lose Air Pressure
    If you are having issues with loosing air out of the 5th Airborne Premium Fifth Wheel Air Ride Coupler part # 5AB-E1621-16K then you would need to inflate the airbag and then spray this and the fittings down with a soapy water solution. There should be bubbles forming where the leak is present. Most likely, the leak is coming for one of the fittings like part # 58382.
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  • Adjusting the Air Spring in a 5th Airborne Premium Fifth Wheel Coupler for a Level Trailer
    To level your 13k 5th Wheel trailer, start with 80 to100 psi (but do not exceed 120 psi). Add air until the skid plate is level. If the ride you experience is too soft (keeps bottoming out), add more pressure. If the ride is too rough, remove pressure until you reach a comfortable medium between too soft and too hard. I call this the Goldilocks Phenomenon. If adjusting the pressure does not provide a satisfactory level ride, try to reposition the air spring. If the pin weight is heavy,...
    view full answer...
  • Availability of Replacement 5th Airborne Air-Ride Pin Box for Venture CJ20517 Pin Box
    We do have a confirmed fit for an Ultra-Fab Trailair Air Ride 5th Wheel King Pin to replace your Venture. The part # UF35-946211 is a direct bolt-on replacement rated to 21,000-lbs. Please note that this unit is not compatible with any type of goose neck adapter. However, currently we do not show a direct bolt-on 5th Airborne Air-Ride pin box to replace the Venture CJ20517 unit that is on your 5th wheel. I checked with my technical contact at 5th Airborne and he confirmed that they too...
    view full answer...
  • Identifying an Unknown Fifth Wheel Pin Box
    Somewhere on the pin box there should be a sticker or a metal plate that lists the part number. If could be located on the top, bottom or side of the pin box. If the sticker or plate has been removed, we can determine the model number of the pin box according to the bolt hole spacing, as shown in the FAQ article I have linked you to. So, if you cannot find the model number, simply follow the directions on the FAQ article and provide me the measurements, and I would be glad to recommend...
    view full answer...
  • Pin Box Upgrade Options for Lippert 1621 15,500 lbs Pin Box
    The information you provided is perfect! The weight rating and the "1621" number you found is exactly what I'd need to know to confirm replacement pin box options. The Lippert options we have include the Rota-Flex # LC328330 and the Trailair Flex # LC328492. The Rota-Flex is basically a step up from the basic 1621 pin box # LC1191191 in that the head can pivot some to help with ride quality. The Trailair uses a rubber compound in the head assembly as well as an air bag and shock to give...
    view full answer...
  • Comparing Reese 5th Airborne Air Ride Pin Boxes for 5th Wheel Trailers
    The 5th Airborne Premium Fifth Wheel Air Ride Coupler - Extended - 12-1/2" Wide Air Ride # 5AB-E510-710 is rated for 21,000 lbs and is a replacement for Lippert 1716, Fabex (500, 503, 765,and 770), and RBW 7028 pin boxes. The 5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity # 5AB-E1621-16K is a replacement for Lippert 1621. The differences other than capacity are in the width and the bolt mounting pattern. I've attached an article to help if needed. Also,...
    view full answer...
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  • Could Bike Pump be Used to Inflate 5th Airborne Cushioned Pin Box
    Typically people end up running around 90-100 psi in the 5th Airborne pin boxes like the # 5AB-E1621-16K so if you had a hand pump that was able to create that much pressure that would work. Most likely that would be too much to do by hand though so typically people find the right pressure at home where they have access to a compressor and then not adjust beyond that point. For a remote inflator that's rated for up to 150 psi you could use the Slime Pro Power Tire Inflator # SLM40031...
    view full answer...
  • How Does 5th Airborne Pin Box part # 5AB-E1621-16K Adjust to Trailer's Pin Weight
    The air bag that is in the 5th Airborne Pin Box part # 5AB-E1621-16K that you referenced does not adjust forward and back when being set up to fit a trailer. Instead you will need to inflate the bag to the appropriate psi so that the skid plate sits level. If you check out the picture I attached you'll see which plate needs to sit level.
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    Image 1 for
  • Replacement Air Bag for 5th Airborne Pin Box
    The 5th Airborne Premium Fifth Wheel Air Ride Coupler - 16,000 lbs Capacity # 5AB-E1621-16K you referenced will use the Replacement Air Spring for 5th Airborne King Pin # 200738. You may also want to consider the Easy Fill Retro Fit Kit for 5th Airborne # 58382 for easier adjustment.
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  • Fifth Airborne Replacement Pin Box for Mor-Ryde 1621
    Other than the heavier duty spring/shock absorber in part # 5AB-E1621-610 which increases the weight capacity, part # 5AB-E1621-610 will bolt up to the Fabex 665,Lippert 1621 and 1621HD and the M&M 665. Part # 5AB-E1621-16K bolts up to the Lippert 1621 only.
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