What is the proper way to lift my 2010 28bh fifth wheel 2"-3"? I have upgraded trucks and the camper sits up in the front I can not alter the hitch due to clearance of bed rails. I would like to do it the correct way, but the only thing I am familiar with are spacer blocks but I have read bad things about that on trailers? Was not sure if a 2" keyed block and new u-bolts would be sufficient or is it really a bad idea?