I have a 1983 Jayco that weighs somewhere between 550kg to 750kg. I am towing with a vehicle that has a towbar tongue and not a hitch. I bought an extended towball to get the height up but the caravan is still not level, replaced the worn springs in the tow vehicle with hardened springs. It's close to level! Any ideas how to get some extra height? I would like to add a hitch and use an adjustable height receiver but I'm not sure if that is possible. If not any way to get it higher would be good.