We have a NL and had to raise 3” using horse stall mat, then 2” condensed form, a thin horse mat on top of form. We have a 2x4 wrapped in foam in front of camper against bed front of truck for bumpers to go against to give enough clearance from truck taillights, and a pool noodle on each side between camper and wheel well pushed down tight. We waxed the bottom of the camper one time which was a disaster, and it slid all over the place. We had to de-wax the bottom. We adjusted the fast guns to specks from watching video. So far this setup is working. You have to split the pool noodles down one side to be able to wedge them in. My husband runs a string thru them and ties them to hooks in bed in case they get loose to keep from losing them.