Which RV and hitch do you have? Does it have the Revolution pin box?
I have my hitch set to the lowest level that it will go and the pin box is about two holes from the lowest level. The hitch sits just below the bed rails.
As long as the pin box will lower enough to maintain the proper level, you won't have any problems. Just make sure that ever how many bolts are in the pin box now, will still be in it once it's lowered. I hope that made sense.
One thing to check for, once it's lowered, is that the pin box will clear the bed rails on a sharp turn. (I doubt it's a problem, just something to check.)
Salem 29RKSS Pushing a 2500 Mega-Cab CTD!
Gotta go campin!