Our last trailer was a Jayco JayFeather LGT 29N and sat quite low to the ground. It had built in skid bars to protect the bottom of the back end, but we added some wheels. Yes it did lower the clearance an additional couple of inches, but the wheels would roll instead of just dragging and I think it was less stress on the frame. The trailer had torsion axles and 14" wheels, and raising it would have involved fabricating some kind of bracket to lower the spot where the axles mounted, changing the two sets of steps from single to double, and replacing all four stabilizing jacks. These were a cheaper, easier solution.