Fold out weather seals

Talking to a dealer who deosn't sell Trailmanors. He said traveling on dirt roads they really suck in dirt bad and while parked didn't seal very well to keep out dirt and wind. I'm looking at a 2007 2720SL in new condition good shape ( I haven't actually seen it yet as it's 200 miles away) Has anyone else had any type of problems with the weather seal ? THANKS