Larry, once again it is important to know what you plan on doing with a travel trailer and how many people will be using it. I would guess that a travel trailer that is 10-15 maybe even 20 yrs old is on its way to being worn out if it is "stick built" (wood structure wrapped with vinyl covered particle board or similar, or even aluminum). The problem is, they leak and have been leaking for some time. LP hoses are dry and possibly cracked, tires are beyond due date, the electronics may be out dated and sketchy, brakes, tanks, sensors etc etc. That's all workable if you intend on staying on/in a trailer court. These trailers need larger vehicles to tow safely. A fiberglass trailers, on the other hand, weigh in at 1000 lbs to 3000 lbs fully loaded. They can be gutted and tricked out to suit your needs because the inside core is dry. Stick built, on the other hand can also be gutted and tricked out to suit your needs but now you may be looking at a whole new can of worms. You may even need a covered area to work on it.
just sayin'