My first trailer (5 years ago) was a 1998 Nash 22H. Bought it from my wife's uncle. I should have done a better job inspecting it (it had a small tear in the rubber roof that had been leaking and caused some rot in the roof and wall). If you buy from a dealer, have them pressure test it for you. Basically they increase the air pressure inside the trailer and then spray soapy water all over the exterior to check for leaks.
If it hasn't leaked and everything on the inside looks nice, buy it and have fun.
If it has leaked... do a VERY thorough inspection of the roof, walls and floors to determine if their is any soft wood.
There is no reason that a properly cared for 8 year old trailer can't be perfectly fine.
