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  1. Fifth Wheel King Pin
  2. Lippert
  3. Leland 7920
  4. 21000 lbs GTW
  5. Absorbs Road Shock and Reduces Chucking
  6. Upgraded Pin Box
Trailair Air Ride 5th Wheel King Pin - Leland 7920 - 21,000 lbs

Trailair Air Ride 5th Wheel King Pin - Leland 7920 - 21,000 lbs

Item # UF35-946208
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Our Price: $1,346.51
Fifth Wheel King Pin
This item qualifies for Free Truck Freight Shipping
Shipping Weight: 184 lbs
Quantity: 
In Stock
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Product Expert Kathleen M

Is this right for you? Product Expert Kathleen M says:

Yes, if you:

  • Like having the "Cadillac" option - RVers with this pin box say it feels like their fiver is floating over the road
  • Often drive over very rough roads and want to save your truck and trailer (and yourself!) from getting beat up by all the bumps and dips

No, if you:

  • Have little space between the pin box and the nose of your trailer which can make monitoring and maintaining the pressure in the air bag a chore
  • Use a gooseneck adapter in your truck to tow your fifth wheel
  • Haul a trailer that weighs over 20,000 lbs
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. 1-636-306-4830 to order Lippert fifth wheel king pin part number UF35-946208 or order online at etrailer.com. Free expert support on all Lippert products. Guaranteed Lowest Price and Fastest Shipping for Trailair Air Ride 5th Wheel King Pin - Leland 7920 - 21,000 lbs. Fifth Wheel King Pin reviews from real customers.
  • All Info
  • Reviews (113)
  • Q & A (0)
  • Photos
  • Why etrailer?

Lippert Fifth Wheel King Pin - UF35-946208

  • Leland 7920
  • 21000 lbs GTW
  • Absorbs Road Shock and Reduces Chucking
  • Lippert
  • Upgraded Pin Box
  • 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.


Features:

  • 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


Specs:

  • Designed to replace the following pin box: Leland 7920
  • Weight capacity: 21,000 lbs
  • Overall travel: 3"
  • 1-Year warranty


Notes:

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

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.



155934 Lippert Components (LCI) Trail Air Kingpin Box - L08

Replaces 35-946208 UltraFab Trail Air Kingpin Box - L08






Customer Reviews

Trailair Air Ride 5th Wheel King Pin - Leland 7920 - 21,000 lbs - UF35-946208

Average Customer Rating:  4.8 out of 5 stars   (113 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.

by:

The Trailair pin box is a great product.
I
installed it before a 700 mile trip and it does what it is intended to do. Etrailer was very helpful in selecting the correct pin box for my trailer.
Thank you.




by:

I just got the pin box, so I don't have it installed yet. It seems very well built. I wish it had a removable eye in the top so I could lift it with the crane that I have in the bed of my truck. No complaints though. Can't wait to try it out.




by:

Good packaging and received quickly.




by:

Review from a similar Trailair in Fifth Wheel King Pin


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!!




by:

Review from a similar Trailair in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair in Fifth Wheel King Pin


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




by:

Review from a similar Trailair in Fifth Wheel King Pin


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.


Comments
Its been a year since last review, still havent had any issues with the pin box. Works well and provides a smooth ride under most conditions. If you run into rough patches on the road youll feel it and in my opinion there isnt anything made today that will eliminate that type of chucking. I also have airbags on my truck and it still happens. Now for the pin box 1. It works as advertised and improves the ride substantially. 2. The pin box is very well built and no issues period. 3. One issue is the air valve on top of the pin box which makes you get up into the truck bed to fill it with air. What would be a improvement would have a extension that attaches to the valve that would allow you to add air without having to get into the truck bed. To summarize, this pin box has been a great investment and if youre looking a replacement box, youll be happy you purchased this one.
David M - 03/04/2022


by:

Review from a similar Trailair in Fifth Wheel King Pin


Air Ride Pinbox arrived on time and in excellent condition. It is a perfect fit and was an easy installation.
Thank You,
Jack Herndon


Comments
I towed our Keystone Raptor about five thousand miles with the original pin box before I decided to try to smooth out the ride so purchased and installed the Trailair Air Ride 5th wheel pin box. I have since towed it approximately Six thousand miles and We are completely satisfied.
Jack - 08/27/2022


by:

Review from a similar Trailair in Fifth Wheel King Pin


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.


Comments
My hitch is working great! It has made a big difference in how well the trailer rides on my truck. No more harsh bumps when I drive over rough roads or poor bridge approaches. Awesome product!
Joe S - 06/23/2021


by:

Review from a similar Trailair in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair in Fifth Wheel King Pin


Can’t believe what a difference it made. Pulling a 38’ Avalanche with a 2019 Ram dually and we now glide over formerly rough bridge approaches. I’m 76 and my brother-in-law is 69 and we installed it at our RV Park in about 20 minutes! That included removing the old one! Recommending it to all my friends!




by:

Review from a similar Trailair in Fifth Wheel King Pin


The pin box worked out very well. You still feel the bumps but almost no chucking. My wife likes to sleep in the truck with her head against the head rest, but she could not do that with the old pin box. The only thing that I had to do with the new pin box was drill out the holes because the old pin box had bigger bolts.




by:

Review from a similar Trailair in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair in Fifth Wheel King Pin


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.




by:

Review from a similar Trailair in Fifth Wheel King Pin


I'm pleased with the pin box. Put it on my 5th. wheel. The airbag gives us a better ride than any other pin box. Its a great product.




by:

Review from a similar Trailair in Fifth Wheel King Pin


Took all the transfer of trailer hunting out of tow vehicle as you travel. Also give me more turning clearance on short bed F250.


Comments
Makes hook up a snap!
Dale H - 10/05/2021


by:

Review from a similar Trailair in Fifth Wheel King Pin


You shipped the wrong kingpin!!! I had mega problems shipping it back to you, while your company held my payment, until you received the incorrect Kingpin back, all due to your company’s error!! That is why I will no longer do busywigh you!




by:

Review from a similar Trailair in Fifth Wheel King Pin


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!




by:

Review from a similar Trailair in Fifth Wheel King Pin


I noticed a much better ride inside my truck after installing my 5th wheel pin box.




by:

Review from a similar Trailair in Fifth Wheel King Pin


Great products fit perfect




by:

Review from a similar Trailair in Fifth Wheel King Pin


Made a huge difference in the way to 5er tows now. Less bouncing and chucking, the coffee maker on the counter stays in place and things inside don’t move around anymore. It cut down on the stress to the 5er more than I expected, I can feel the difference in the driver seat also so it has been a very nice upgrade.




by:

Review from a similar Trailair in Fifth Wheel King Pin


Looks like a very good product, Easy installation only took an hour. Took it on a short test run On a very rough road It seemed to work well but we'll know more on the next upcoming trip. Packaging was inadequate could have used more Tie down straps , but no damage.etrailer is great to work with!!!




by:

Review from a similar Trailair in Fifth Wheel King Pin


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).




by:

Review from a similar Trailair in Fifth Wheel King Pin


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..


Comments
I still love the ride it provides- always smooth. Wouldn’t use a standard kingpin again. The airbags lose air over time- it’s my only complaint. Not enough to effect performance on a week-long trip but it loses air. I tightened the fill valve. Will re-tape the valve again if needed.
Bernie C - 05/26/2020

25
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Show More Reviews

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



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    Yes, the Trailair Fifth Wheel Air-Ride Coupler # UF35-946208 can be used with a gooseneck adapter. The air spring in the 5th Airborne pin box helps to reduce the effects of vertical and horizontal shock. This pin box is a direct replacement for the Leland 7920 and 7921 pin boxes.
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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
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Expert Research:
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Employee Lindsey S
Written by:
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Employee Jeff D
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Employee Kathleen M
Updated by:
Kathleen M
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Employee Mike S
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Mike S

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