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.