I am almost ready to purchase a 2013 Thor Freedom Elite 21c motorhome. It has 55,000 miles and seems to be in really good condition. Since it is from a personal owner I can't get a pdi. I looked for some obvious problems and it didn't seem to have any, but what do you guys recommend I make sure to check thoroughly before purchasing it. I am a newbie in the rv world and need some advice. Thanks!