I have two of these. One I extended by three scale feet, but never haveing seen the UNDERSIDE of one i haven't done too much more to it. It has a larger interior thanks to the stretch, and it sure makes a BIG difference compared to an unstretched one! These are NICE lookin models IF you can find 'em. I paid 50 bucks for each one, which I felt was a GREAT price for what i got! Thanks for the posts Tom. Did you make the masters For Jeff Ballards Econoline van? If so, you are a MASTER CRAFTSMAN, as it is as beautiful as your motorhome!!!!!