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  1. Fifth Wheel King Pin
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  4. Venture CJ13515
  5. Venture CJ13517
  6. Venture Short
Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture - 21,000 lbs

Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture - 21,000 lbs

Item # UF35-946219
Our Price: $1,423.81
Fifth Wheel King Pin
Shipping Weight: 184 lbs
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Experience smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with an air-ride-equipped model. The scissoring action of the coupler allows the interior air bag to absorb road shock so that you won't feel it. 1-800-940-8924 to order Lippert fifth wheel king pin part number UF35-946219 or order online at Free expert support on all Lippert products. Great prices and Fastest Shipping for Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture - 21,000 lbs. Fifth Wheel King Pin reviews from real customers.
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  • Reviews (141)
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Lippert Fifth Wheel King Pin - UF35-946219

  • Steelco-Davis PB01
  • Venture CJ13515
  • Venture CJ13517
  • Venture Short
  • 21000 lbs GTW
  • Upgraded Pin Box
  • Lippert
  • Absorbs Road Shock and Reduces Chucking
  • Fixed Turret

Experience smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with an air-ride-equipped model. The scissoring action of the coupler allows the interior air bag to absorb road shock so that you won't feel it.


  • Air ride pin box replaces standard pin box on your 5th-wheel trailer to enhance performance
    • Cushions and absorbs road shock
    • Improves handling and overall ride
    • Limits strain on truck and trailer frames
  • Scissor action allows pin box to compress, compensating for jarring and bounce
    • Internal air bag absorbs the road shock
    • Built-in spring ensures that pin box rebounds - keeps air bag from breaking down
  • Direct replacement for OEM pin box
  • King pin connects to any 5th-wheel trailer hitch
  • Sturdy steel construction


  • Designed to replace the following pin boxes:
    • Steelco/Davis PB01
    • Venture CJ13515, CJ13517 and Short
  • Weight capacity: 21,000 lbs
  • 1-Year warranty


  • Not for use with any type of gooseneck adapter
  • Because of the size of this item, it ships via truck freight

UF35-946219 Dimensions

Eliminate the bounce from your ride with the Trailair air ride coupler. The unique scissoring action of the pin box ensures that road shock is absorbed, preventing the harsh, rigid ride that you typically encounter while towing your fifth-wheel trailer. Not only does this improve your overall towing experience, but it also helps maintain a sound, well-functioning system. Less bounce and jarring means less stress on your truck, trailer and hitch.

Trailair Air Ride Coupler

How the Trailair Air Ride Works

When you encounter uneven terrain on your trip or hit a pothole on the highway, the Trailair pin box compresses, transferring the road shock to its internal air bag. A built-in air spring ensures that this compression occurs in a controlled fashion so that the air bag doesn't burst. It also causes the pin box to appropriately rebound, positioning it so that it's ready for the next bump in the road.

155945 Lippert Components (LCI) Trail Air Kingpin Box - M23

Replaces 35-946219 UltraFab Trail Air Kingpin Box - M23

Customer Satisfaction Score:

Customer Reviews

Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture - 21,000 lbs - UF35-946219

Average Customer Rating:  4.7 out of 5 stars   (141 Customer Reviews)

Experience smooth, stable towing with your fifth-wheel trailer by replacing your ordinary pin box with an air-ride-equipped model. The scissoring action of the coupler allows the interior air bag to absorb road shock so that you won't feel it.


It took about a month to get here but we are so glad it did. Thank y’all so much!


Really is a smooth ride after adding the air cushion pin box. Makes pulling a pleasure.


There is a smoother ride now, but it didn't eliminate the push/pull effect completely while going down the highway as I was told by another it would do. All in all I am glad I bought it.


Freight co delivery estimated for Friday, arrived today. (Tuesday). Borrowed a tractor, dropped the old and lifted this monster into place. 12- 15/16 bolts (originally) 18 hole mount. Not sure if the height is correct for the bed, but will adjust it down if after the rubber bumper is inflated, if it doesn’t sit level. The bolt pattern was correct. better get help! From dropping the MFG lippert, to getting the thing lifted an bolts snugged up, about 45min. Will take a bit longer to attach the deadman switch and electrical box. Well crafted, definitely heavy. This should save my truck n RV from porpoising damage as I’m going over Bridges and bad roads.


Our fifth wheel experienced pin box cross frame cracking while on a trip. After having it properly repaired I decided to invest in the Trail-air pin box to alleviate the shock and harsh pounding from our lousy roads. I purchased from and installed it myself. Being only a 29 foot 5th wheel the tounge weight is low so after experimenting with pressures I run 40 psi in it and it flexes when hitting bumps or dips taking the stress off the trailer. Tows like a dream. Knowing what I know now I would have bought and installed it when I bought the 5th wheel and saved a repair during a trip. It is expensive but well worth it.


Have put around 10K miles on the hitch so far and it has performed well. An extra step in the pre-departure checklist to check the airbag pressure/ride height, but it is worth it as it greatly reduces the jarring from pot holes and abrupt changes in road surface. Installation was easy; perfect fit.


the fit was perfert. as you can see from the pictures is attached, i drilled a hole in the top to drain water that collects. i fabercated a cover to fit over the opening.

by: 05/08/2023

We're so anxious to try out our new Curt TrailAir.
Installation went smoothly, it looks great.
We can hardly wait to experience the ride!


Best upgrade to the 5th wheel you can do. Our first cross country trip and I-40 beat the snot out of us on all the bridge transitions with the stock pin box. Immediately ordered this unit and now it’s like the trailer is floating behind us. I run 65 psi in the airbag. Solid unit and easy installation.


I’ll start from the second I ordered this online. Confirmation email, then within days a shipping confirmation. When I ordered my shipping said 2 weeks out for delivery. I got the item in 9 days. The communication from the freight service was top notch. Unlike, some reviews the item was in great condition when it arrived. On a pallet in a box. No complaints. The driver even let me back up to his lift gate and help me slide the item into my truck for easier install. I had previously removed the factory hitch box prior to arrival so when the upgraded item arrived I was ready for install. Took about an hour to line everything up. Used a jack in the truck bed to help lift item where I needed it. I haven’t towed with it yet, that’ll be next week. But it looks beastly and like it’ll be a much more comfortable ride for me and my truck. Very happy so far, will leave an updated review after an out of state trip next weekend. etrailer was great. First item Ive ordered from you all but I’ll be back. Thank you!! Happy customer!!


Exact fit replacement for cheap Keystone OEM part. Fit was so exact, I installed it by myself. Arrived earlier than expected. I hope this will reduce the chucking and smooth out the pull of a 16K RV trailer. I did have to purchase additional bolt sets from my local Home Depot (OEM was 12 sets, this is 18 sets 5/8-11 x 2in Grade 8 with flat and lock washers all torqued to 180 ft lbs).


I just completed a 2800 mile trip after installing the Trail Air Air Ride pin box on my Solitude 5th wheel. I was able to install it myself from the bed of my pickup using a hydraulic bottle jack to lift it into position.

I previously made the same trip with the factory installed MORryde Cushioned Pin Box and the Trail Air provides a greatly improved ride. With the MORryde, I encountered several sections of concrete highway that set up a front-to-back oscillation which persisted across many miles. I didn't have that issue with the Trail Air.

I didn't order the Flex Air model that also included the flexible block because I was concerned the added height of that pin box would have been a problem. However, after installing the non-flex Trail Air I've found that the other one would have also worked out if I lowered my truck hitch an inch or two.

Also worth noting, this pin box is four inches shorter than the 1621 MORryde it replaced. However with a long bed truck I have no clearance issues and can still lower the tailgate when hitched up.


I purchased this Lippert Air Ride hitch for my 40 foot Genesis Supreme trailer and wish I had bought it 2 years ago and installed it. What a difference is has made both in the trailer when towing as well as the difference in my truck while pulling it down the road. eTrailer had the best price and fast shipping. They as well helped me with verifying the right part number that works with my trailer. I purchase many parts and accessories from eTrailer and will continue to purchase from them in the future.


The king pin has eliminated about 80% of the chucking. I pull 16k fiver. I am very happy with it. Related I always use etrailer for my parts purchase. One time I was stranded near Disneyland. I needed shackle. They had me triple check for correct part and rushed delivery. These guys are the real deal.


Obviously a quality product made with quality materials. As you can see in the photo I placed the bottom bolts in the bottom hole. Problem is the bottom steel place is very close to the hardware so I had to have the bolt facing outward on the two bottom forward bolts. Don’t like torquing bolt heads but it worked. This is being very nit picky Torqued to 160 ft lbs.


Smooths out the ride greatly, really pleased with so far. I removed the Air chuck and installed a tee with Gauge and air chuck makes it easy to monitor air pressure before traveling, one should note that these do bleed pressure down in few weeks that is pretty much normal for air bags of this type. I have a Dewalt cordless mini compressor and it works great to quickly & quietly pressurize before trip. I usually set my at 65 PSI


This is an outstanding pin box. It makes our trailer pull really nice. I know everyone says "I didn't even know I was towing anything" which is usually not the case, however with this, it really was like nothing was/is behind me. I highly recommend this product.


Easy install. I dropped it down one hole Vs. the factory one and still has all 10 bolts without drilling any holes.


I think that this is just what the doctor ordered. I have not installed it yet, but this looks very much like what I need for my trailer!


Good looking product. Mounted it on a Montana 40ft 5th wheel. It arrived 2 weeks ahead of schedule. It was easy to install. I did have to grind the corners of the trailer frame bracket as the jaw hinge wouldn’t allow the bolt holes to line up. Once the corners were ground, everything lined up perfectly. It only took my son and I to pick up the pin box and once the first bolt was in, it was simple and easy to do the rest. There are 3 things to complain about. 1. The position of the air valve sucks. Really hard to get at. 2. The mark on the shock for proper inflation is not marked well. Had to get on hands and knees with a flashlight to actually see it. It was suppose to be bright yellow, it’s black, same as the shock. My 3rd complaint would be the fact that I had to drill 3 holes into the pin box to reattach the brake safety cable and the electrical wire box. The biggest positive thing is, is how much of a difference it has made in the ride quality for not only with the trailer but the truck as well. Soooo much smoother than the original pin box. Would I buy another one? You better believe I would. Wondering why I didn’t buy it sooner. Won’t have another 5th wheel without it.


With the help of my wife, I had the Flex Air pin box installed within 1.5 hours. Used a floor jack on top of my pickup tailgate.


Have not did a road test yet but it’s installed.
Way heavier than factory. I have talked to many that have this and like it.
Helps reduce chucking back and forth movement. Nothing will be solve all if you are on a rough road you will feel it.
No hitch will eliminate.
Was fairly easy to install you will need help to lift. I used the tailgate on the truck and backed under and used blocking to get in place. I installed pretty much myself. My wife help some with aligning the bolts.


We bought a new fifth wheel right after we bought the pen box and we were going to have it put on our new fifth wheel but the bolt holes didn’t match up. Therefore it was never used and has been sitting on our RV LOT ever since. We couldn’t rate because never used it but only way it would let us submit our comments


I love this AirRide by Trail-air. It provides an incredibly smooth ride on the road. You can adjust the amount of air for your ride, the Schrader valve is right on top of the unit and easy to access. My Trail air installed easily on my Forest River Sandpiper 372LOK mid bunk, especially with help from my Dad. This Trailair solved a big problem for me. I needed an extra couple of inches space between my 2018 Ford Super Duty DRW and the coach. My truck came with the Ford factory-installed Reese 27K hitch and I needed more clearance to allow the tailgate to drop without touching the coach. The kingpin on the Trailair sits at least 2” forward of the factory kingpin and provided that desperately needed space. It really makes for smooth and quiet ride !
etrailer folks were very helpful. The first unit was damaged by the freight company and when I notified them, etrailer sent another unit quickly. I will buy from etrailer whenever I can..


Added this pin box to improve ride and give my rv a smoother pull. The owners manual says you can use the orginal nuts and bolts, but felt getting new ones that are grade 8 was the best route for me.
The pin box had several deep scratches due to shipping so I mounted it and then painted over the scratches and resolved the problem.
The rebound shock didn't have the yellow arrow like the one in the pictures, does have an max inflation stamped in the shock but black on black doesn't help for proper inflation so I painted the arrow yellow, not great but it works.
Number one issue is no matter the inflation of the airbag I can't get it too the top of the arrow as required. I checked the PSI on the airbag and was at 135 PSI. I felt that was too high of air pressure and there's nothing in the manual or online to say how much air should be in an airbag so I went with 98 PSI to be safe.
As for the ride I feel it was an improvement over the previous pin box but to be honest my F450 has airbags as well, so was the improvement due to the pin box or because of the truck airbags. I'll go with both had factors with the ride. But the number 1 factor for me was the 21000 weight capacity. 4 out of 5 is the issue with inflation and what's correct.

Show More Reviews

See what our Experts say about this Lippert Fifth Wheel King Pin

  • Will a Ultra-Fab Trailair Air 5th Wheel King Pin fit a Pullrite Super Glide 5th Wheel Hitch
    You can use a Trailair air ride coupler like # UF35-946219 with a Pullrite Super Glide 5th wheel trailer hitch. In order to get the correct air ride coupler I would need to know your existing pin box manufacturer and model number. This information is normally located on a plate or sticker on the pin box itself. The Trailair that you referenced fits Steelco/Davis PB01 and Venture CJ13515, CJ13517 and Short pin boxes. You will need a capture plate but we do not carry the Pullrite line of...
    view full answer...
  • Recommended Pin Box Replacement For Venture Short Pin Box
    I have attached a help article for you to confirm size, but based on what measurements you gave, I am fairly confident you have a Venture Short Pin Box. We only have one pin box replacement for that, and I am very pleased to say that it will meet your needs. I recommend for your trailer the Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture - 21,000 lbs # UF35-946219. This is a direct replacement for your OEM pin box that is an air-ride-equipped model. The interior air bag...
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  • How Much Air is Needed in the Lippert Trailair Pin Box for Proper Operation
    My contact at Lippert confirmed with me that when adding air to the Lippert Trailair Air Ride Pin Box, # UF35-946219, will need to be hooked to the vehicle. There isn't a specific amount of pressure you have to use. Instead it is recommended to inflate the air bag to maintain a ride height.They do list a range from 20 to 120 psi and they say never exceed 120 psi.
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  • How to Pick Out The Correct Cushioned Pin Box for a 2000 Hitchhiker 2 31 RLBG
    In order to pick out the correct cushioned pin box for your 2000 Hitchhiker 2 Fifth Wheel trailer you will need to know which pin box model you have on your trailer. Most king pins will have the pinbox number listed on a sticker/plate or it will be stamped on the king pin itself. If it's not there or worn out you will need to call the trailer manufacturer with the vin number of your trailer so they can provide you with that information. Check out the FAQ article I attached on cushioned...
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  • Replacement Cushioned Pin Box for a Short Venture Pin Box on a 1997 Airstream
    We do have a replacement cushioned pin box option for your short Venture pin box on your 1997 Airstream. The Trailair Air Ride 5th Wheel King Pin # UF35-946219 is a direct replacement for what you have. The pin doesn't site between the bolt holes like what you mentioned the original one does, but this is what Lippert says will be compatible as a replacement. If you check out the attached diagram you can compare the following measurements with your current pin box. 2a - 8" 2b - 1-1/2" 2c...
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    Image 1 for
  • What is the Difference Between Trailair Pin Boxes UF35-946211 and UF35-946219
    The difference between the two Trailair Pin Boxes that you referenced are the pin boxes they are designed to replace on a trailer. The part # UF35-946211 is designed to fit the Venture CJ20515 and CJ20517 and Steelco/Davis PB02,PB02W whereas the part # UF35-946219 is designed to replace the Steelco/Davis PB01 and Venture CJ13515, CJ13517 and Short. Either would be fine with your long bed truck, it would just be a matter of picking out the right one to replace the pin box on your trailer.
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  • What Ultra-Fab Trailair Air Ride 5th Wheel King Pin Replaces the Venture CJ13517 Pin Box
    You will want the Ultra-Fab Trailair Tri-Glide, # UF35-946219 which is the M23 pin box that you mentioned. I have included product link for you to check out.
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  • Replacement Pin Box For A Venture CJ13517 Pin Box
    The Lippert 1621HD 5th Wheel Pin Box # LC1191151 that you mentioned will only work as a replacement with Lippert 1621HD 5th wheel pin boxes. Since you mentioned you have the Venture CJ13517 pin box, this is not going to work for you, however I do have another option. Check out the: -Trailair Air Ride 5th Wheel King Pin # UF35-946219 instead. This pin box will work as a replacement for Steelco/Davis PB01, Venture CJ13515, CJ13517 and Short pin boxes. . This pin box has a maximum weight...
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  • Pin Box Replacement Recommendation for Venture Pin Box for More Turning Clearance
    If you have a Venture pin box model number CJ13515, CJ13517 or CJ20517 you could use a Sidewinder pin box replacement # RP61450 to give you additional turning clearance as it sounds like that is what you are after. However, if you have a Venture Short (which is very similar) we have the Trailair Air Ride 5th Wheel King Pin # UF35-946219 which is a confirmed fit that is more like an extended style of pin box.
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  • Are Lippert Trailair Air Ride Pin Boxes Compatible With Curt Q-Series Hitches
    The Trailair Air Ride style pin boxes have a slightly different design than the Rota-Flex pin boxes, making them compatible with Curt Q-Series 5th wheel hitches. So to answer your question, the Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture # UF35-946219 will work with your Curt Q24 5th Wheel Hitch # C16245. I do want to also note that the # UF35-946219 is only designed to fit the following bolt patterns: Steelco-Davis PB01 Venture CJ13515 Venture CJ13517 Venture Short If...
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  • Replacing A Venture CJ13517 Pin Box
    Your 5th wheel is equipped with a Venture CJ13517 pin box, and I'm sorry to say that there is not a compatible Gen-Y Goose Box model. So your best bet will be to continue to use your B&W Companion hitch. If you want to replace your pin box, we do have the Trailair Air Ride 5th Wheel King Pin # UF35-946219. This will be a nice upgrade from the current pin box, as it offers the cushion and shock absorption of an air bag.
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    Image 1 for Image 2 for
  • What TrailAir Pin Box Replaces M-Tec RVPN1409 and Venture CJ13515 5th Wheel Pin Boxes
    My contact at 5th Airborne confirms the M-Tec pin box on your 5th wheel, number RVPN1409, corresponds to Venture pin box reference CJ13515 and can be replaced with their # 5AB-S13515 or any of the other pin boxes shown on the attached link. The 5th Airborne Sidewinder pin box that corresponds to your original is part # RP61452. This pin box is rated for 16K trailers and is a direct bolt-on installation. You can re-use your existing hardware. Note that Sidewinder type pin boxes cannot...
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  • Replacement Pin Box for Venture CJ13517 Pin Box
    There are two pin boxes we offer that can be used as replacement for your Venture CJ13517 pin box and only one of them is rated for your application on a GVWR of 17000-lbs. Because of this you will need to use the Trailair Air Ride 5th Wheel King Pin # UF35-946219, which has a capacity of 21000-lbs and is a direct replacement for your Venture pin box. This is a premium pin box that will cushion and absorb road shock, improve handling and overall ride, and will limit strain on truck and...
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  • Pin Box Upgrade Recommendation For An M-Tec RVPN1409 Pin Box
    The 5th Airborne Premium 5th Wheel Air Ride King Pin w/ Sidewinder and Turret - 16,000lbs Item RP61452 is the correct replacement for your M-Tec RVPN1409 and you are correct that the B&W Companion Gooseneck-to-5th-Wheel Trailer Hitch Adapter - Dual Jaw - 20,000lbs Item # BWRVK3500 is not to be used with a sidewinder. Since you can't use a sidewinder with your current hitch I recommend upgrading to the Trailair Air Ride 5th Wheel King Pin - Steelco/Davis, Venture - 21,000lbs Item # UF35-946219....
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  • Towing a 102 Inch Wide 5th Wheel Trailer with a 2016 GMC Sierra 2500 Short Bed
    To get the clearance you need to tow your 102 inch wide 1996 Gulf Stream Kingsley 5th wheel trailer a replacement pin box will not offer enough extension. Basically the distance from the back of the truck cab to the center of the king pin when the trailer is coupled has to be at least 4 inches more than half the width of the trailer. That means that you would need a cab to king pin distance of 55 inches. If you have the factory 5th wheel prep package in your 2016 GMC Sierra 2500 or an...
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Info for this part was:

Employee Lindsey S
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Expert Research:
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Expert Research:
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Employee Kathleen M
Updated by:
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Employee Laura H
Updated by:
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