I don't think this would be possible. The outside wall of the slide out is cut out of the original wall. Since yours is already cut to the smaller size it would be impossible to use the existing wall. You would have to buy a whole new wall and start from there. The cost would be really high to replace the whole wall. But then if you have the money any thing is possible, if not practical.
Has anyone tried to use a car wash bay to wash their PC?
Last September while on a trip to Yellowstone my PC got really dirty and their were car wash bays in town. I kept looking at them wondering if I could fit under the wash arm but I could not find any signs giving the max high allowed. Since my PC is on the E-450 the specs say it is 10' 1" high, 2 inches higher than the E-350. I have occasionally seen over sized bays for larger vehicles but these were the standard size. It sure would be nice to be able to use a car wash bay while on trips when it gets really really dirty.
I wash and wax my motorhome using "Gel-Gloss Heavy duty RV Wash & Wax". http://www.gel-glossrv.com/index.php?pageId=393. I start at the top on the roof by climbing up there and using a long handle brush, then back on the ground I do the sides. I have never needed to hand wax my motorhomes as this stuff leaves a really good shine. There are several products by Gel-gloss including a couple of waxes. Someday I may try the cleaner & wax or the straight wax they sell, but for now I am happy with just washing it and having it wax itself. I can get very lazy sometimes.
Barry you are welcome. I hope you enjoy them as much as we enjoy ours. Just don't suggest a friend sit in them for a few minutes to try them. I did and they used them all evening while we had to sit in their old bag chairs.
Barry is there a reason you have not fill in the information on your profile? I am just wondering.