Proper 5th Wheel Hitch Position

I ran in to the same problem when I upgraded my truck from a 2003 Silverado 2500 HD to a 2015 Sierra 3500 DRW. In order to maintain bed rail clearance and keep the trailer as level as possible while towing, I had a 2 inch lift installed on the trailer. As you found out, the OEM steps became and issue, making getting in the trailer more of a challenge. I ended up replacing the OEM 3 step assembly with a Torklift Glow Step 4 step assembly - problems solved. The Torklift steps are great. Because the bottom of the step assembly is supported on the ground by adjustable feet, the trailer bouncing motion while leaving or entering the trailer is eliminated.

I will add that if you do end up lifting the FW the step may then be too tall and the stabilizers too short. But, if enough money is thrown at it all those issues can be resolved. :)

Pull the FW onto enough scrap lumber so that it is level. You will then know the rail clearance and what adjustments are needed. After you know that the rail clearance is ok you will also know what needs to be done with the rig.

My auto slide hitch needed low profile feet/mounts and raised the pin box yet also went to 16 inch lt tires and an axle flip on FW. There are endless threads in here about it depending on how it's searched for.

All of the newer trucks are pretty tall and there are so many spring, block, drive type, tire size, and other considerations that you really will have to see in person. Fortunately, there's quite a range of heights where you'll be able to tow, even if it's not ideal.

I'm in somewhat the same position. I'm going to lower my truck about 2 inches, which should help, but I'd also like some additional bed rail clearance. I am hoping to avoid flipping the axles because fifth wheels are already boxy and tall enough, but that may end up being the solution for me.

Is your truck 4wd? Are there blocks in the rear under the leaf springs and above the axle?