We have a low end Starcraft AR-ONE 14RB. We found that the framing for the couch and the dinette were sub-par, to the point of the ends not even completely meeting at the corners, and they had to be rebuilt (under warranty). Don't accept sub par construction. We didn't think to look at this until we removed them to store items under them, and we discovered it.
Also make sure that all plumbing pipes and fixtures are tight (kitchen, bathroom, outdoor shower). On a previous TT (not a Starcraft), we discovered a leak under the kitchen sink that was caused by the pipe not connected tightly - easy fix. Along those same lines, make sure all sinks drain properly and that the toilet flushes properly. Make sure the dealer then empties the fresh water tank before you tow it home, and also winterizes it, if you'll be in freezing weather.
Make sure your slide outs' seals are installed correctly. The same previous TT was actually missing one, which caused it to leak, ruining cabinets inside. Thankfully, it was under warranty, so we didn't have to pay for the replacements.
One thing most people don't think about - make sure the cable connections work for t.v. viewing. We've had more than one TT that had cables behind the wall that were crimped, causing lack of cable t.v. reception.
Make sure all appliances work, and that all lights (interior/exterior), the slides, tank indicators lights, etc. work properly. Make sure the technician doing your walk through shows you every switch, every moving part, etc. That's his/her job. Don't be rushed through your walk through and ask questions. Take notes or video it, because you won't be able to remember everything.
I'm sure others will have other things to look for.
Beth and Joe
Camping Buddies: Maddie (maltese/westie?), Kramer (chi/terrier?), and Lido (yellow lab)
2017 Keystone Bullet 248RKS
2014 Aliner Expedition Off Road
2013 Ram 1500 HEMI