There are several techniques to build.
My 2002 Fleetwood, even it has "aluminum frame" painted on it, it has basically aluminum skeleton, where wood members are screw to skeleton for gluing sidings to them.
I bought it with patched roof from the state with lot of rain, so water penetration made for lot of headaches, but the delamination happen between the inner wood skin and outer fiberglass, when inner skin would still hold to the frame.
My conclusion is that without aluminum skeleton, the camper would collapse with rotten wood years ago.
