photoguy,
I own a 30' Haulmark motorhome. We purchased in February 2004. After 20,000 miles I can't find any evidence of flex in the wall system. Corners are tight, trim still fits well and I've never had a leak. We race offroad and the rig has seen more 4 wheelin' terrain than most Jeeps on the road today!
![](http://www.truckhome.com/infopop/emoticons/icon_eek.gif)
I had my doubts about the large cab cutout initially, but it has been trouble free so far.
I have seen some FRP patches on a friend's Renegade and they looked pretty good to me. If you know where they are you can see them, but they blend in pretty good. I hope I don't have to report on how the smooth FRP Haulmark uses takes a patch!
I didn't think Haulmark ever used the aluminum composite panels on their stackers. I thought they were originally welded hat/tube sections with applied aluminum. The last time I was there they were using FRP panels similar to Renegade, but I didn't get a look at the supporting framework.