I have a 2015 Road Warrior 305RW and a 2015 Ford F250 4x4 SRW short bed with Firestone Ride Rite air bags. Went initially with a 5th Airborne Sidewinder pin box. Would not work as it lowers the pin 4" - 6" below the stock Lippert 1621HD mounted height. It gave additional turning clearance but caused huge drive-ability issues with the trailer being too nose high. With a Reese 18k Elite hitch in the lowest position the front of the trailer was over 8" higher than the back. There was no way to raise the unit up to the highest mounting holes on the mount as it would have interfered with the rotation of the bottom of the sidewinder. It also caused terrible porpoising compared to the stock pin box. I towed with this setup for 1,500 miles and forced the dealership to take it back. I re-installed the 1621hd, leveled the trailer, and eliminated the ill-handling problems. Reese engineering blamed the new Ford truck for being too high in the back. I believe their product was designed for older vehicles, which were lower in back. Time to step up Reese and re-design your product for the current crop of tow vehicles. Until they do, I will pass. Very happy with the stock pin box and set up. I think the Ride Rites eliminated the need for the cushioned pin box. The combination of Sidewinder moving the trailer back further, along with the air bags and 5th airborne, compounded the porpoising problem and made an ill handling, dangerous combination.