Wow, that is quite beastly for 2 people. We have a 25 footer for 4 people but only for sleeping in and rainy weather shelter and thats enough room. Otherwise we are sitting around the fire, hiking, etc. You really have to ask yourself if you want the space, or do you want the more private campsites. At least here where Im at the smaller the camper, the better the campsites.
But...If you guys are determined on that length, as with any other camper definitely look for water damage. there's 2 types of campers......those that leak and those that will. Look for soft floors and water stains on ceilings. Also check the caulking all around and the water systems. These bad boys are fun, but they require maintenance!!