Looking at the fit, finish, how the backsides of drawers, and other areas that you normally don't look in will tell a lot. Also, if you find one you like, do a really good PDI. Don't be afraid to ask about having the tanks filled to the top to see if the vent pipes work, the tanks hold water, and drain well. One thing that I saw the other day, was to see if you can do what you need to do with the slides in. That way you will know if you can reach the john, sink, microwave, etc. Plan to spend several hours doing the PDI. Ask for a hose and spray all comparttment doors, slides in and out, and so on. Use a straight stream (ever drive in a pouring rain?).
