Buying a trailer without a thorough PDI is pretty foolish. You could easily find yourself spending more than what you planned on, fixing all the things that weren't quite what they were represented to be. A salesman wants to sell, pure and simple.
I might do it for a $500 trailer, but not for something that costs 10 times that, and not a chance that I'd do it for something in the price range you're considering. Unless, of course, you have lots of money and are willing to risk it. In that case, send the money to me and I'll see you get a great trailer.