I don't want to burst your bubble but........buying anything vintage will require repairs in one way or another. You can mitigate this somewhat by buying a garage kept well maintained trailer or motorhome but be prepared to pay a pretty dear price; even then, repairs and maintenance will be needed.
Towing a trailer is like having your house in a continuous moving earthquake; things break.
I say this with warmth; good luck with your search.
Per Mare, Per Terram and may all your campaigns be successful.
“It’s a recession when your neighbor loses his job; it’s a depression when you lose your own.” "Harry S Truman"