Hi! My father has a 1989 Tioga Arrow (I believe) which is 21' and has a 350 Chevy engine. He bought it brand new in '89 and only put 9k miles on it. Never took it further then 400 miles RT with most trips being less then 90miles RT. This RV has sat on the side of the house 99.9% of it's existence in the CA sun. Now my family is planning on going on a long trip this summer roughly 3k miles RT, but my dad is worried his won't make it. His heater and air conditioner don't work and I think he needs to change his fuel filter. My question is, what can I do to test this thing to see if it's road worthy? I know that sitting is worse then driving it a ton. Should I feel comfortable with just changing the hoses and belts? I have no idea even where to begin. Any and all advise would be greatly appreciated. If this was your dad, what would you tell him or have him do? Thanks!!