What type of things should a buy beware of when purchasing a used camper?

make sure all the plumbing works and have them fill the tanks with water to make sure it was properly winterized. check around the water heater and heater to make sure there aren't any hot spots on the walls. and always always grease the wheels and shut of the propane at the cylinder before you go too far if you buy one. you wouldn't believe the campers i see along the road missing wheels and burnt to the ground.

If you want every thing to work, ask and check (have them show you) AC, gas stove, water heater, furance, water lines are not broke (a big one) ref. works, vent fans work, lights work.. inside ond out. Depending on price and all can be repaired/replaced, but buy as they work.