We have bought 2 campers now, Our first a 29' TT purchased locally. Never having seen a travel trailer we took about 3 hours with this seller to go over this one and were extremely lucky to find a great camper and a great seller without having done any research or even knowing what to look for.
Decided to upgrade to a bigger unit after 9 months and we contracted on a NEW camper in southern Florida, Drove 600 miles to get it only to find it was missing an entire AC unit that was in the listing and on the spec sheet...
so you never can tell but I would be cautious to buy anything, even NEW without seeing it first.