Check under neath where the house portion is attached to the frame of the Ford, see if it is sitting on rubber mounts or if it is on wood, check the height of the rubber with one of the back ones, if it is on wood check for fry rot.
To check for dry rot use an ice pick if it goes in real easy the wood is gone, good wood the pic barely penetrates.
Also check the Ford portion, unless you purchased the unit new there might be some damage to the cabin from an accident.
The rubber bushings can be replaced, they are a bear to do.
navegator