You might want to do a little research as to the height of a RWD to a 4 wheel drive. My 2020 Chevrolet 2500HD is the same height as a 4 wheel drive. I had lower my last 2008 Chevrolet 2500HD 2" in the rear. The top of my bed rail is 5" higher than my old truck. My leafsprings on my 5th wheel already set on top of my axles, so I went to Trailerblocks.com and bought 3" blocks to raise my trailer up so it sits more level when pulling with new truck. My buddy has a 2010 F350 with a 3 1/2" lift kit, my bed rail is 1" higher than his bed rail.
