My Dina bus uses adhesive to secure the aluminum sides and it hasn't come loose in 22 years since the bus was built.
I used to own a Jayco travel trailer. The quality of Jayco seemed to be ahead of the other travel trailers I looked at. I did have a major quality issue with mine where a block of wood was too short and the worker still installed the block of wood rather than grab another one. I guess piece work means you cut corners to get more work done. It took me a whole day to fix that issue properly as the dealer didn't fix it.
These days I wouldn't consider a travel trailer that doesn't use metal wall framing. It might cost more, but it will last longer if any water gets in.