IMO, the biggest concern on an older unit is water damage; water spots on the ceiling, soft floors, soft or damaged roof, spongy walls, or moldy smell would indicate some water damage. Other concerns is towability; tires and axles.
2012 Crusader 320RLT
2011 F250 Lariat 6.7L
2016 (19 Nights Camped/1348 Miles)
2015 (38 Nights Camped/3560 Miles)
2014 (28 Nights Camped/1980 Miles)
2013 (30 Nights Camped/1411 Miles)