Fiberglass siding looks better in my opinion. However, in cases of water damage, it becomes something of a disposable box. Bought new and properly maintained and this should not be an issue.
I have a used aluminum sided TT. The slide floor is rotten and I am about to replace. This requires removing several pieces of aluminum siding from the slide walls. Not a big deal to do. If this were a fiberglass trailer, it would be a much bigger project.
Several manufacturers are making bunk houses now that not only have a couch but also dedicated swivel chairs. All are too heavy for a 1/2 ton. You could always replace the sofa with a residential reclining love seat or a pair of small chairs.
