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  1. Fifth Wheel King Pin
  2. Reese
  3. Fabex 665
  4. Lippert 1621
  5. Lippert 1621HD
  6. 665 M and M
5th Airborne Premium Fifth Wheel Air Ride Coupler - 21,000 lbs Capacity

5th Airborne Premium Fifth Wheel Air Ride Coupler - 21,000 lbs Capacity

Item # 5AB-E1621-610
Our Price: $1,171.68
You Save: $886.33
Fifth Wheel King Pin
This item qualifies for Free Shipping
Shipping Weight: 136 lbs
In Stock
5AB-E1621-610 - Absorbs Road Shock and Reduces Chucking Reese Fifth Wheel King Pin
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The 5th Airborne premium fifth wheel air-ride 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 rid possible by reducing shock. 1-636-306-4830 to order Reese fifth wheel king pin part number 5AB-E1621-610 or order online at Free expert support on all Reese products. Great prices and Fastest Shipping for 5th Airborne Premium Fifth Wheel Air Ride Coupler - 21,000 lbs Capacity. Fifth Wheel King Pin reviews from real customers.
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  • Reviews (96)
  • Q & A (0)
  • Photos
  • Why etrailer?

Reese Fifth Wheel King Pin - 5AB-E1621-610

  • Fabex 665
  • Lippert 1621
  • Lippert 1621HD
  • 665 M and M
  • 21000 lbs GTW
  • Absorbs Road Shock and Reduces Chucking
  • Reese
  • Upgraded Pin Box
  • Fixed Turret

The 5th Airborne premium fifth wheel air-ride 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 rid possible by reducing shock.


  • 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
  • Streamlined, aerodynamic design


  • Capacity: 21,000 lbs
  • CSA approved
  • Designed for use with the following pin boxes
    • Fabex (665)
    • Lippert (1621 and 1621HD)
    • M&M (665)

5th Airborne Premium Fifth Wheel Air-Ride Coupler:

  • 1. Rear Mounted, heavy-duty shock absorber
  • 2. Enclosed air spring also absorbs shock
  • 2. King pin - connects to the fifth wheel trailer hitch in the truck bed
  • 4. Pivot point - allows king pin to move up and down

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

5AB-E1621-610 - 5th Airborne Premium Fifth Wheel Coupler - Extended 12" Wide Air Ride

Installation Details 5AB-E1621-610 Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

5th Airborne Premium Fifth Wheel Air Ride Coupler - 21,000 lbs Capacity - 5AB-E1621-610

Average Customer Rating:  4.5 out of 5 stars   (96 Customer Reviews)

The 5th Airborne premium fifth wheel air-ride 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 rid possible by reducing shock.


Was looking for a fifth wheel trailer porpoising solution and this helped considerably. It took some time to figure out the right air pressure to put on king pin and air lifts I have on truck to find the right combination. Although I miss the chuck free Motoryde feel, I’ll take a slight chucking vs. my trailer coming apart from bouncing up and down. Much cheaper and convenient solution to others I have seen.

Great! One thing I’ve learned is to adjust the air pressure for the air bags to limit the amount of support needed to level the hitch but also allow the shock to absorb the bumps. Too much air pressure can result in a bounce effect. Since I have air bags on truck as well, the two sets of aur bags over pressurized can counter the shocks ability to absorb l.
Frank - 09/30/2022


Unit arrived in good condition. Was a breeze to install, about a 1 hour job with 2 people including removal of old Tri-Glide. Didn't like the "banging" back and forth with the tri-glide.
The only issue I had was having to drill pilot hole for breakaway switch screw. Non issue! Can't wait to make a haul with it. Alaska here we come!

We put over 9000 miles on our new setup. The difference in the ride was amazing! Wouldnt have any other setup. I did add airbags to the truck as well. At times we had to look back to see if the trailer was still there. Its a 40 ft. toy hauler towed with a F350 dually, 6.7 powerstroke.
ROY J - 05/03/2018


The 5th Airborne Air Ride Coupler is very well made with quality welds.
Installing on a 2010 Cyclone 3612 Toy Hauler, I did have to cut about 1/2 inch from the fiberglass at the top front of the Lippert Trailer Mount. This modification provided the 3/8"
vertical movement required to allow the front 3 bolt holes to line up.
Other than the small fiberglass trim, a very clean installation.


This hitch is great, no more chucking and it also takes the hard bounce out. Would recommend to anyone. You will need to adjust the pressure in the air bag to suit the weight of your pin. 100% better pull, you wont be sorry.


I contacted etrailer several times trying to figure out how to fix my problem. Everyone there that I spoke with was very knowledgeable and helpful. They shipped the product right away and I received it a day before expected. I can't say enough about the great people at etrailer. I would definitely recommend them to anyone looking for trailer parts.


I have a 40 foot, 16,000 GVWR fifth wheel towed by a 1 ton, SRW, long bed with Timbrens also purchased from etrailer. The FW came with a Rotaflex kingpin. The kingpin did a good job with chucking, but the overall ride was very rough. I decided to go with the Reese Fifth Airborne.
We went on a 250 mile trip just before installation of the Reese Fifth Airborne. My wife likes to knit while riding. There were stretches of the interstate where she would have to stop because the ride was so rough. We happened to go over the same stretch of road after the installation of the Reese Fifth Airborne. She did not have to stop her knitting once. The road doesn't turn smooth as glass with this kingpin, but the jarring is eliminated and turned into a a smooth, more subtle bounce.
There are similar products on the market and other setups that are greatly more expensive. IMO, the Reese Fifth Airborne works very well, is relatively affordable and doesn't detract from the looks of the FW. And, of course, purchasing from etrailer is great.

Im continuing to be pleased with the Reese Fifth Airborne. Hard jolts are minimized. Just dont feel nearly as beat up after a day of towing.
Edward K - 05/01/2021


Very good quality and easy to install. Took a little more than an hour. Helps to have a tractor with forks and a good cordless impact wrench. Other reviews say it works well. Still snow here but can not wait to try it. Have new Bighorn and with factory pinbox it was a rough 200 miles home.


Dana at etrailer was the best, order shipped same day and I received it within two days. Installation of the 5th Airborne was very easy and a well built product.


I have a 2018 F350 SRW with a Andersen ultimate 5th and I’m at the top of my payload with my 41’ 5th wheel. I’m just a weekend warrior but when I got my fifth wheel I experienced SEVERE bucking even on my 20 mph test drive. After more research I leveled the trailer worked on the pin weight and got much improved but I still really felt stressed and white knuckled while towing. The fifth wheel had a mind of it own and going up grades I was forced to stress the truck by pulling harder with higher rpm to keep tension and prevent the chugging effect. Not happy considering the 50K trailer investment we made, me and my wife were fairly upset with the experience.

I first looked at the air ride pin boxes because it seemed to offer a diverse range of options based on the problems I had but when I called to talk to the manufacturer despite what e trailer says about the compatibility with certain air ride options they flat out told me don’t do it. He wouldn’t even suggest or recommend me the best for my problems he simply repeated 4-5 times “we don’t recommend any adapters for our hitches, only standard 5th wheel connections”

So I did more research and found the 5th airborne. Highly reviewed but realistically it was one of a limited variety of pin box choices I had left so I got it And had sky high hopes

I’m currently at the campground. Took the same roads I took here about a month ago and WOW. MAKES SUCH A DIFFERENCE. Wife and I are shocked. We feel comfortable bringing the baby along on our river weekend trips, annual family trip from Southern California to Shasta lake and have confidence in our setup being as smooth as towing a 13K pound trailer can be. I honestly didn’t think It’d help as much as it did

Installation was fairly easy. I’m a busy dude but used my truck bed and a floor jack and borrowed my wife for an hour and we got it installed. When I installed I moved it higher on the 5th frame I believe the 5th airborne will tend to sit high specifically when the air bag is inflated and if you have to inflate to 100 or so psi. I started mine at 100, drove about 15 mins on highway and felt no difference at first

Pulled over realized the trailer was again nose high by 3 inches so I first bled down to about 85 psi and lowered my hitch an inch and I still sit 1 inch nose high but the ride was BUTTER.

Found the sweet spot and I will never change it. Loving the setup completely worth the money. 5th airborne should be a stock set up in my opinion there shouldn’t be any other way to tow!


This will raise your pin height. I had to lower fifth wheel plate in truck and modify air ride coupler to fit correctly in pin box. Intalled in 2020 coachmen chapparral 392mbl


Fit great, no problems installing it other than I had to get a little creative to get in the right position to bolt it in. You can see the Marine Corps training work, improvise, overcome and adapt.


The lady who helped me on the phone knew her products. The product shipped right away and was delivered in three days. It was delivered in good shape. it only took a couple of hours to install. That included messing around. There was two of us because of the weight and we were both senior citizens. Really appreciated the ease of installing. I purchased the product because of the jolt caused by the cracks in the cement when pulling my 5th wheel.
Customer service was excellent


Product arrived on time with no damage.
in about two hours.
Great improvement in towing 42', 16000 lb 5th wheel. No more jerking and bouncing.


Thank you for such prompt service, it was ordered the afternoon of 11/2/17 and delivered on 11/6/17. I'll be installing the 5th AIRBORNE Pin Box this coming weekend.
Thank you so much Shawn, Definitely a FIVE STAR SERVICE !!
Thanks again,
Neil Barney


Very easy to install and made a big difference in the ride

Makes a big difference towing, one of my purchases
bob - 03/31/2020


This is the second time I have used this product and it works wonderfully smooths out ride nicely.


Very happy with 5th Airborne pin box. Experience W/ Etrailer was very good. Would order from them again.


Awesome Pinbox , bolt on as advertised , in retrospect an additional pair of hands would be helpful but I was able to install it by myself. The towing experience is a major improvement over a fixed pinbox


E-trailer knew their product, shipped in quick order, fair price, satisfied with product. Would definitely do business with this company again!!!!!


Service and delivery were excellent as was the price. In the process of installing. Waiting for two more strong arms.


Excellent product, well packaged, promptly shipped!! Thank you etrailer!


Product was shipped extremely quick Product mounted with no modification needed excellent service


Arrived as scheduled. Set up on new 5ver was easy with extra hands. Great doing business


I received my order Friday and already installed it on my Trailer
Everything went very good


Easy to install and adjust. It performs like a champ.

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