I agree on the Park/Destination model for more room. Also you don't need a big truck if you're setting it up in an RV park for several years. You can have it delivered cheaply.
RV's are a different breed than a home or renting an apt. Quarterly maintenance will be greater. Mostly inspections of the roof caulking, window caulking, trim caulking, etc. They're also not insulated as well as newer homes. You'll need skirting if you're in an area of the country that gets pretty cold in the winters.
$55K is not much so looking at used ones would be better.
Good luck in your journey. Sometimes you just gotta do what you gotta do.