Sorry AustinS, when it comes to buying used it is caveat emptor. The fine print of the warranty you purchased also doesn't cover tires or anything in the normal wear and tear category. It was a good gesture for them to buy one, but I know that's not what you want or feel satisfied with and I don't blame you.
ANYONE looking to buy used should familiarize yourself with reading the DOT code on the sidewall of a tire so you can translate the manufactured date. If that date shows 3 years old on an ST tire, expect to put new tires on the camper and get them in the deal if buying from a dealer.
AustinS, I would suggest you replace all tires, including the spare! I'd also pull one drum and check the bearings to see if they were serviced.
