On a 36' gasoline coach I used to have, it come equipped with the Firestone air lifts. I would put 90lbs of air and the rear end would lift up. I also had a pair of casters and they bolted to the frame right next to the skid plates. I bought them at an rv dealership for eighty dollars and they also worked real good.
I never did like fpr the skid plate to touch the pavement, it seemed like the whole rear end cap was tearing off. Fact I still have the casters taking up room in one of my compartments. Need to get rid of them, don't need them with the DP.