Our spot is sloped so the front of the camper is higher than the rear. We have those ramps you drive onto and then put a little wedge under to secure. We put them under just the back wheels. It did help, but it's still higher in the front and now I'm stressed it's going to damage our shocks or something under there because it looks uneven just having it on one tire on each side. Do the ramps need to go on all 4 tires?