When I bought my D used the latch thuingy to flatten out the very rear pass seat is broken, they took a quick look, but said they would have to take the seat apart and as such weren't going to fix it, after all it is used. The battery was weak and rather than them replace it they made a deal 2 headsets(it didn't have any) instead of a new battery which actually worked out better for me because I had a brand new redtop sitting at home.
The don't do a lot of of the small repairs on used vehicles.... mechanical they should..
Check the tire wear for abnormal pattern..
If you can look underneath for off roading damage, any sort of fluid leaks..
you now pretty much all the normal stuff you'd look for...