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  1. Fifth Wheel King Pin
  2. Reese
  3. 16000 lbs GTW
  4. Upgraded Pin Box
  5. Absorbs Road Shock and Reduces Chucking
  6. Provides Turning Clearance
5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder - No Turret - 16,000 lbs

5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder - No Turret - 16,000 lbs

Item # 5AS16K
Our Price: $1,521.40
You Save: $1,318.97
Fifth Wheel King Pin
Shipping Weight: 135 lbs
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Connect the turret portion (sold separately) of the sidewinder to this arm assembly to create a complete 5th Airborne sidewinder, which will enable you to easily make up to 90-degree turns. The built-in air bag both cushions and supports your load. 1-800-940-8924 to order Reese fifth wheel king pin part number 5AS16K or order online at Free expert support on all Reese products. Great prices and Fastest Shipping for 5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder - No Turret - 16,000 lbs. Fifth Wheel King Pin reviews from real customers.
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Reese Fifth Wheel King Pin - 5AS16K

  • 16000 lbs GTW
  • Upgraded Pin Box
  • Reese
  • Absorbs Road Shock and Reduces Chucking
  • Provides Turning Clearance
  • No Turret

Connect the turret portion (sold separately) of the sidewinder to this arm assembly to create a complete 5th Airborne sidewinder, which will enable you to easily make up to 90-degree turns. The built-in air bag both cushions and supports your load.


  • 5th-Wheel trailer's pivot point is moved an extra 22" toward the rear of your tow vehicle so that you can easily make 90-degree turns, even with a short-bed pickup truck
    • Rotating turret (ST100, ST200, ST300, ST400 or ST500 - sold separately) required
    • No need to get out of your truck, throw a switch, push a button or mount a 5th-wheel slider
    • Trailer tracks more closely to the truck for better driveability
  • Fully enclosed, custom-tuned air spring in air ride trailer coupler - cushions and absorbs shock
    • Reduces longitudinal shock (chucking) by nearly 60 percent
    • Decreases vertical shock by 44 percent
    • Relieves stress on coach frame
    • Reduces vibration inside coach, protecting its contents
  • Air bag can be repositioned with 2 easy-to-access screws to better support varying loads
    • Move forward for light tongue weights
    • Move backward for heavy tongue weights
  • King pin connects to standard 5th-wheel trailer hitch and allows easy hookup and disconnect at any angle
  • 1-Piece, streamlined construction
  • C-Channel design of sidewinder provides more stability and strength than standard pin box
    • Able to support heavier loads


  • Capacity: 16,000 lbs
  • Clearance: see formula below to ensure proper clearance
  • 3-Year limited warranty

Clearance Formula

Use the formula below to ensure that there will be enough space between your truck cab and trailer when you are executing a 90-degree turn with the 5th Airborne sidewinder installed.

(A + B) - C = Clearance

A = Distance from center of 5th-wheel hitch jaw to truck cab in inches

B = Length of sidewinder arm in inches (22")

C = Width of trailer in inches divided by 2

For example:

If you are using the 16,000-lb 5th Airborne sidewinder, then B = 22"

If the distance from the center of your hitch to your truck's cab is 36", then A = 36"

And, if your fifth-wheel trailer is 102" wide, then C = 51"

102/2 = 51


(36 + 22) - 51 = 7" of clearance

Reese Elite Airborne Sidewinder

5AS16K Fifth Airborne Sidewinder Arm Assembly without Turret

Installation Details 5AS16K Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder - No Turret - 16,000 lbs - 5AS16K

Average Customer Rating:  4.5 out of 5 stars   (97 Customer Reviews)

Connect the turret portion (sold separately) of the sidewinder to this arm assembly to create a complete 5th Airborne sidewinder, which will enable you to easily make up to 90-degree turns. The built-in air bag both cushions and supports your load.


Excellent Item, Very good seller excellent communication and service

Steven C.




I've had my Elite Airborne Sidewinder for about 6 months now. it's mounted on a 33 ft Jayco and pulled by a 2016 F-150 Lariat with a 5.5 ft box and the Max tow package. Total trailer weight is about 7800 lbs empty and closer to 9-9500 when we are loaded. We have done several short trips (under 200 miles) and one longer one so far from Montreal to Charleston, SC.

I'm nothing short of blown away by this coupler. There is no chucking, and it pulls so smooth you'd hardly think there was a trailer back there. Even my wife has commented that it hardly feels like we're towing. The sidewinder allows 90 degree turns easily and I can back it down a 80 ft driveway easily. I check the air once in a while in the air ride and have yet to check the key but I can back on to it easily. This coupler does exactly what it was advertised to do, and does it extremely well. We've had it out 6 times this year already and have a few more in mind before calling it a season. My thanks to Reese for an amazing coupler and to Pat and etrailer for their help in getting it to me so fast! Great customer service!


I love the Air Ride King Pin with Sidewinder. The air cushion has removed the lag when taking off and stopping as well as smoothing out the trailer movement on rough road. The solid construction has served me well on our recent 2000-mile road trip.

I tow a 12,000 lb fifth wheel with a short bed 3/4 ton truck.


The pin box greatly increases the maneuverability of the trailer / truck combination by moving the pivot point back under the front of the trailer rather than in the middle of the hitch in the truck bed. Additionally, the air ride greatly smooths the bumps out on the road and reduces chucking when braking or accelerating. The only reason for not giving 5 stars is that you MUST be perfectly aligned with the pin box in order to attach it to the hitch. Unlike a traditional king pin, this one is modified to have a large steel plate behind it to force the pin box to pivot under the trailer. This means you MUST be perfectly aligned with the pin box to get it to connect to the trailer. Normally, this is not an issue if you are able to back or pull the trailer to the point where the pin box is straight with respect to the trailer. however, often spots require backing in but are not deep enough to straighten the pin box to the trailer. This means that the truck must be backed in at what ever angle the pin box is at to get it to engage in the hitch.


Reese Sidewinder RV hitch for short bed tow vehicles . This model has air bag suspension (replaced the non air suspension model)
Yes this product works good the ride is much less harsh, although the air suspension model is much higher and I did need to lower the fifth wheel hitch to get the trailer front lowered to a safer tow mode . There was initial damage from shipping (the air filling valve stem is installed when shipping and sticks out if and pokes Out of the box and was bent) Spoke to Reese and they took care in suppling a new valve and connections.


Got the box in time for my last trip of about 400 mi. Round trip.
I am replacing a plain sidewinder which is a great improvement over a sliding hitch- mainly because I am able to remove my Reese titan hitch myself without hurting my back. My last hitch slid automatically but weighted a ton.
The box had come open when it arrived, it appears that the packing staples had pulled out. I installed it myself without a great degree if difficulty and discovered the top wear ring was not included. Luckily I had the one from my regular sidewinder.
Don't know if I did it or it happened in shipping but the air valve was mashed on the end. I struggled getting the cap off and had to file it back round again to get an air nozzle on it. It is very soft brass and probably should be protected better for shipping and handling since it is easily damaged.
I was very disappointed in the performance. I drove a road with expansion joints and wished I had the plain sidewinder back on.
After I got home I moved the airbag and adjusted the air pressure in an attempt to smooth the ride. I haven't given it a fair trial yet with the new adjustments.
Sure seems like a lot of money for no significant improvement at this point.


I really like my new King Pin with airbag and sidewinder and turret. I am not the greatest at backing up but I feel I have better control due to the geometry change. It is much easier to make sharp 90 degree turns. I hated to have to stop and move the slider. I have had to reset the four bolts on top of the turret and the two bolts holding the wedge to 150 pounds. I use a white lithium spray to ensure an easier connection. I am still trying to figure out what pressure I should set the airbag though. I have it set between 60 and 65. The ride is very smooth with very little chucking.


I would have left 5 stars, but the package arrived just about destroyed and the pin box was significantly scratched and the air valve was bent and had to be replaced which I did myself. I had to touch up the paint on the frame of my trailer from the old pin box, so i also touched up all the scratches from shipping.
The hitch is absolutely awesome and was exactly what I was looking for to absorb some road shock! Just got back from a 1,700 mile trip and although it took some experimenting along the way to get it just right, it was worth it. Probably going to add a compressor and wireless valve to control the pressure in the cab because weight and air temps require different psi's. When we left Chicago it was 30° and by the time we got to southern Arkansas, it was 75° and had to let the air out 3 times. On our way back, had to add air multiple times.


This item arrived quickly. There was some rust inside of the mounting cavity that had to be removed before installing the 5th Airborne. You may also experience some swelling from the manufacturer welding up the pin box cavity. Once this is cleaned up, installation is easy.


Installed this in 10 minutes. Super Easy to install, you can do it by yourself if you're strong and have some skills. Having a helping hand doesn't hurt though. Although the custom bed isn't done on my truck, it's time for vacation. I used a new B&W turnover ball and companion 5th wheel hitch and connected my newly (easily) installed Airborn air bagged pin box.... rides like a dream!!!!! I shouldn't have used my other non-air ride pin box for 10 years! This pic shows my test run, usually the car is a boat.


am happy with my new pinbox. Installation was very easy with some help, fit perfectly. I had to run a die nut over 2 trunion bolts that were damaged during shipping. I haven't tried towing yet, but so far I am pleased with my purchase. I have enclosed some pictures of my installation.


The pin box was easily installed and works great.When installed the lable with name and specs is partially covered by the mount on the frame.


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!


Wow...what a difference!
Replaced our
pin box with the 5th Airboure and the ride immediately improved. Almost no chucking!
Even my wife noticed how nice and smooth the truck now rides.


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.


I haven't used the air ride pin box yet, but I will be going on a trip this weekend. Installation was a breeze with the help of my son to place in position. It took about 45 min. to remove the old pin box and install the Airborne. Another 30 min. to secure the electrics and trailer emergency brake switch.


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.


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.


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.


Received my 5th Airborne pin box in 3 days. I didn’t have any help readily available and I couldn’t wait. It was a direct replacement of my old pin box. The guy I was emailing was very helpful and helped me correct my order as I ordered the wrong one and caught my mistake before it processed. He was great to work with as erailer always is. Highly recommend these guys for all your trailering needs.
It was a little aggravating to install alone with some makeshift braces and 2 large screwdrivers to line up holes. Be sure to sand the inside of the frame if any rust or anomalies are present. Other than that, was a simple install and fit as it should. Thank You etrailer!


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.


Thank you Amy for your knowledge and help with purchasing a replacement 5th wheel pin box and spare tire, everything fit perfectly and showed up a day early.


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 really like this hitch. It must be setup properly to function. Initial assembly takes a bit to fit everything together and grease is a must. I ended up pressing the two halves together at work. When I received the hitch, the airline for the airbag was bent and needs to be replaced. I never contacted etrailer for this since it’s a fairly straight forward fix. My camper pulls smooth and the hitch takes away a lot of the chucking. Backing up with the pivot point now under the camper and not at the hitch takes a bit to get used to but ultimately works better. I’ve been pulling trailers all my adult life commercially. I am happy with the steel and build quality. I doubt I will have any manufacturing issues with this hitch. Again, my only two complaints are initial assembly is a little more than homeowner grade, as well as getting the non pivot block, that stops the King pin rotation, is a bit tedious to adjust. The simple way to install this is to have it done at a professional shop that has experience with these hitches.


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.

Show More Reviews

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

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    I spoke with my contact at Reese and unfortunately you cannot upgrade from a Reese Revolution to a 5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder # 5AS16K. When a fifth wheel trailer like your 2013 Forest River Flagstaff comes with the OEM Reese Revolution pinbox there are no other pin boxes that will fit. Once you have a Revolution pin box the only way to change it out is to do a major fabrication of your fifth wheel.
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  • Should There be Ridge on Bottom of 5th Airborne Premium 5AS16K
    Thank you for the purchase, and yes there is supposed to be a ridge at the bottom of the 5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder - No Turret # 5AS16K. If you take a look at the photo I have added, you can see that ridge which does not allow the wedge to sit completely flat, which is normal.
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  • 2023 Keystone Cougar 368MBI Parts Needed for Pin Box Upgrade to Reese Sidewinder
    Yes, the 16K 5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder # 5AS16K will be perfect for your 14K 2023 Keystone Cougar 368MBI. Please note you also need the rotating turret part RP61300. This is currently unavailable so you'll want to search elsewhere to see if you can pick up this specific part even if it's used.
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    I believe I have a solution for you. A Sidewinder pin box will give you an additional 22 inches of clearance and should give you plenty of clearance for you to make a 90 degree turn with your 2006 Ford F250 Super Duty and 26 foot Holiday Rambler Alumascape 5th Wheel Hitch. Check out the FAQ article I attached on Sidewinders for you to check out. In order to pick out the right Sidewinder you will need to know which model pin box is currently on your trailer. Once you have that information...
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  • What Hardware Is Needed To Lockout The Reese Sidewinder Rotating Pin Box
    We don't have the lockout bolts for your 5th Airborne Premium 5th Wheel Air Ride King Pin with Sidewinder # 5AS16K, however you just need (2) 3/4" x 5 1/2" grade 5 bolts which you can just get at any local hardware store.
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  • Recommended Suspension Enhancement For A 2021 Durango Gold 391RKQ
    While traditional leaf springs support your trailer to prevent bottoming out, they don't necessarily provide a comfortable ride. Due to the rigidity of the steel construction, leaf springs do a poor job of absorbing shock and bounce and limiting sway. Because of that I recommend installing the Roadmaster Comfort Ride Shock Absorbers for Tandem Axle Trailers - 5,200-lb to 7,000-lb Axle # RM-2460 on your 2021 Durango Gold 391RKQ. Adding these shocks to your existing leaf spring suspension...
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  • Can Sidewinder Pin Boxes have Slight Side to Side Movement When Towing 5th Wheel Trailer
    There is a lot of weight, a lot of force involved with 5th wheel towing. You may be seeing the metal flexing. Or it could be that the wedge is not all the way into position allowing for slight movement at the wedge which looks like more movement further back. It is not anything out of the ordinary. If you end up getting a Sidewinder I recommend making sure the wedge is in its proper position before torqueing it down to spec.
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  • Which Sidewinder Pin Box Replaces Leland 7900 of 1999 Jayco Designer 3610
    According to my contact at Reese the Leland 7900 pin box has the same measurements as the 7910 which means the correct Sidewinder for it would be # ST400-5AS16K. With this you'd have considerably more clearance than your Pro Series slider. Almost 9 more inches of clearance to be exact. If you use this with your slider hitch you have to leave the hitch slid forward at all times.
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  • Is There a Sidewinder Replacement Without Air Bag for Leland 7921 Pin Box
    I checked with Reese and the only rotating pin box they offer to replace a Leland 7921 is the 5th Airborne Premium 5th Wheel Air Ride King Pin part # ST400-5AS16K which has an integrated air bag. That said, the integrated air bag will do an excellent job of helping to reduce road shock so it's really a great feature to have. The reduced road shock will make the ride more enjoyable and produce less wear and tear on the suspension.
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  • Is a Sidewinder Pin Box Hard to Turn By Hand
    The turret of a Sidewinder will be pretty difficult to turn by hand. I had the joy of trying to install a Sidewinder arm into it's turret once and it was very difficult. The fit is very tight. Sounds like yours is totally fine.
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  • Are "Spacers" Available For Reese Hitch That Does Not Match Pin Box Flanges?
    If your Reese Sidewinder you bought was a # ST400-5AS16K then it is designed for 16,000 pounds and your 7910 bolt pattern. If you purchased a different Sidewinder then it will not fit - as you have found. I reached out to my contact at Reese and they do not have spacers to fix this, nor do they recommend using spacers in this situation. I also inquired about a turret only replacement but they do not have those in the bolt pattern that you would need.
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  • Will Sidewinder Pin Box Work With B&W fifth Wheel Hitch On Ford Truck With Factory Prep Package
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    It sounds like you want to remove the wedge on your Sidewinder pin box. All that is required to remove that is to remove the bolts holding the wedge in place. It is simply two bolts and lock washers as the pin box has the integrated weld nuts. You will want to replace the wedge prior to using the Sidewinder as that is a key component to keep the function and not have dual rotating parts which would be extremely dangerous. If you are wanting to make the Sidewinder more like a traditional...
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  • Recommended Sidewinder Pin Box to Replace Leland 7921 Pin Box on 16,000 lbs GVWR 5th Wheel
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    I spoke with my contact at 5th Airborne and he informed me that your Leland 7900 pin box will fit all the same air ride pin boxes as the Leland 7910 pin boxes. That means you can use the 5th Airborne/Sidewinder combo, # ST400-5AS16K.
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    On a 6-1/2 foot bed, you may not need to remove the tailgate or use a 5th wheel tailgate when using a Sidewinder. However, I would still recommend either removing the tailgate or adding a 5th wheel tailgate anyway, better safe than sorry, especially on a new truck. I have included a link to the 5th wheel tailgates we offer fora 2012 Dodge Ram. On a 6-1/2 foot bed, a slider hitch is normally enough extension, when slid back in the maneuvering position, to safely make tight turns. The only...
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  • Is a 5th Wheel Slider Hitch Needed on a 2012 Dodge Ram 2500 With 6-1/2 ft Bed With Sidewinder
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  • How Often Does Air Need to be Added to Reese 5th Airborne Air Ride King Pin
    I spoke with my contact at Reese regarding the air bag for the 5th Airborne Premium Air Ride King Pin # ST400-5AS16K. He said that while they don't have an official length of time as to how long air will stay pumped into the bag without any significant pressure loss, you certainly shouldn't have to fill/adjust it every day. A good rule to go by is to simply check the air bag before each trip (not each day within the trip but simply before leaving home). Now with any air-filled component...
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  • Solution for Picking Out Sidewinder When Pin Box Model Can't be Found
    What you will need to do is check out the help article I attached that details how to measure your current pin box so that you can determine what pin box you have and from there determine what Sidewinder you would need.
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  • How To Clean And Lubricate The Wear Plate On A Reese Sidewinder King Pin Part # 5AS16K
    Per the instructions for the Reese 5th Airborne Sidewinder Standard Arm with King Pin part # 5AS16K, in order to clean and lubricate the wear plate, you must first remove the turret. This can be done by removing the 4 5/8" cap bolts from the top of the pivot arm followed by the 2 3/4" convertible bolts located on the bottom side of the king pin. Once done, you will have to use a pry bar to remove the sleeve around the pivot arm, be careful not to scrape or nick the pivot arm upon disassembly....
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