I would agree with Gupster. The underside looks crusty. Maybe no big deal, but a steam cleaning would help.
I didn't like the mis-matched interior parts, core support has maybe been wacked, good that the pictures are in nice daylight, but the angles the photos have been taken from are weird, like there are blemishes they don't want in the photos. Does that mean that the seller is hiding something? maybe, maybe not. Whats under the roll-on bedliner?
In September I bought one similar to this one for around the same price, but it was a frame off with a bunch of new metal and rather poorly finished, embarrassing body work. Verdict is still out on whether I paid too much.
All that said, sadly, $30k does not buy much these days. Might be an OK deal. Helpful that the Seller will face time you if you are interested.