Looking at a 2013 Premier 31 BHPR

[Stunya]

Hello all. Long time lurker and first time poster. Been looking at gently used travel trailers for about a year and found a good looking 2013 Premier BHPR.

I checked it out today and found all testable functions working (slides, lights, etc), but the unit is winterized, so I couldn't check water flow and too cold for A/C.

I am well versed in used cars and am mechanically savvy. Can I get some advice of things that I should look for to ensure I am not buying a lemon? Any help is greatly appreciated.

Thanks in advance.

Doug