ppine wrote:
which is going to rot faster when it gets wet, wood or welded aluminum?
You are still confusing the issue.
Many aluminimum skin units come with aluminum frames. This is not a new thing. I recall my Dad grumbling about the wood frame on the old trailer failing when he got a new aluminum skin/aluminum frame trailer in 1978.
Fiberglass skin units really do poorly if they leak because the substrate for the fiberglass is plywood. Go walk around a park and count the number of units over 5yrs old that you can see delamination from the road. I've done this a couple times and at 5yrs, it seems to be around 50% have delamination visible from the road. If you include up to 10yrs old, it's probably in the 80-90% range. (of course that doesn't mean there isn't hidden issues in the aluminum sided units)
Reality is unless you are special ordering new or going on the smaller side, you won't have a lot of aluminum RV's to choose from.