Take someone with you with a video camcorder. Helps to recall how systems etc operate.
Make sure all the systems work...including W/S wipers/washer. In fact make a list. Stare at a coach picture and visualize everything, or if you have an old coach, sit inside and make your list.
If it has basement air, make sure they have it plugged into 50Amp so you can feel both compressors on. Depending on where you are weather wise, the heat pump make not work right now.
Turn the hot water heater on. It should warm up with 10-12 minutes while you're checking the coach out.
Bring something small/portable (radio or fan?)to plug into each outlet, including the outlet in outside storage.
Have them pull the covers off each battery so you can see if the water is low. Check the dates on the tires.
Make sure the switches that afford watching TV in the bedroom do what they're supposed to.
Make sure the driver's seat isn't bent from the slide hitting the back of it.
Try each and every window, check for bent misaligned frames and latches.
Check the awning and/or if it has window awnings and the slide toppers.
After all, if it's an 07, it's been sitting around.
OK now, someone else jump in here and finish this list, gotta go to work now.
Jeff and Carme