I am totally new to travel trailer scene. A need for us to buy one has recently arisen. There is an Avion for sale that I am looking at. It is about a 30 footer, 1976 or 1979. What is it worth? What should I look for with a unit this old? Did this type have much problems with leaking? Frig doesn't work. Old LP tanks. Does Avion stil make RV's? I did an internet search but couldn't find anything current.