Also check around the slide area. My dealer told me this is where most of the delamination problems are found.
Outside, look down the sides of the trailer, especially towards the top. Look for a wavey appearence. If you find any and it flexes when you push on it, it's probably delamination.
Inside, feel the wall to see if there is any swelling. When the styrofoam insulation gets wet, it will swell. It may be hard to see, but you can feel it when you run your hand over the wall. You may find some small hard bumps, sort of like a rash. This is also a sign of a leak in the walls. Check around the doors as well.
Hopefully everything will check out. If it does, I think you'll really enjoy this trailer. Great, roomy floorplan. The bedroom is on the small side, but I'm only in there at night so it's no big deal to me. The bathroom is the full width of the trailer, so lots of room with storage and a nice large shower.
It does have a heavy tongue weight, so be sure to get a proper hitch (1,200 lb bars). I recommend the Reese Dual Cam or Equal-i-zer.
Make sure the dealer does a complete PDI with you. Operate all systems, check the dump valves, check under the sinks for leaks, run the water heater (gas & electric), AC and heater if possible. There's quite a bit to go through and a good inspection will take a couple of hours so you may want to video tape it.
Good luck. I hope things work out for you.