Welcome to JOF
With any brand used RV the most critical inspection should be associated with checking for any type of moisture intrusion...., this can be one of the most costly repairs if not caught early.
Inspect the interior walls/ceiling for any moisture stains, or raised 'dimples' on the ceiling/wall surface. Remove the interior A/C ceiling panel and check for moisture around the A/C gasket and associated wood framing. Check for stains around windows, bathroom tub area, and open all cabinets.
Inspect the roof surface for any damage, check all exterior seams, caulking, etc.. Inspect the outside marker lights, frequent place for water to get in. Look inside all outside storage compartments for any signs of moisture intrusion.
If the TT has a Filon exterior, check for signs of delamination.
Hope this helps.