Hi and welcome!
Video taping the walkthrough is a great idea. We just took notepads and jotted down the important stuff.
As far as the walkthrough, just be sure to look at everything! Open all doors, drawers and cabinets, look for any damage, look for screws popping out, loose panels ect. Also, have hime fire up all the appliances (TV, heater, A/C, Stereo, ect) and make sure they all work to your satisfaction, check all the faucets and make sure they work. Look for water damage ect.
Heres is a link to a list you can download http://camping.about.com/gi/o.htm?zi...yout%3Ddefault
I think list #7 on that page is for motorhomes. I didn't use one of these lists for our walkthrough, kinda seemed like overkill to me. But I did read through it and it prompted a few questions to bring up.
Good luck! Have fun