hey raul what you want to check for is the normal wear and tear make sure everything works ,does it have a fuel station,did the generator come with it or is it a portable one that they put in there because some can be loud and get annoying ,check the tanks black,gray and fresh check all lines, check the onside and outside panels and the floor,make sure the fridge fires up...does it have ac.....i just say because i have a 2006 weekend warrior and have had problems with the fridge and now my fuel station doesnt work ..i need to look at it...but there are so many little thing with these that need checking and going over to make sure there all good.....but good luck .......ohh yeah and another thing about the pop outs my uncle has one like that and they can get pretty noisey when it gets windy,but then you can always close it