I suggest getting the frame checked first, they will tell you about the axle
at the same time. You may be better off to get a divorce and another trailer unless you are sure this is the one. I suggest making a list of all that needs doing and take it with you for an estimate. Just an FYI, a little trailer is much more complicated than most houses, you have dual wiring 12V and 120V as well as the running lights
gas for cooking and maybe furnace
and 3 way fridge
, water tanks for clean and dirty, external water supply. All in a very confined space!