The problem with a coach of that age is IF a major drive train component goes bad, like the engine or transmission, the value of the coach can quickly go to close to zero, regardless of how the interior looks or the other systems perform.
Rebuilding the engine will not increase the value of the coach, even tho it will cost thousands. Rebuilding the transmission will not increase the value of the coach and again, can cost thousands with zero return on that expense.
For the one year you plan on living in it, buy a trailer and have someone deliver it to your parking place if you do not want to buy a used truck. A trailer usually depreciates to a bottom figure and stays there.