The choices are stick&tin and composite. The composites are only coated with polyester resin and fibreglass.
I just finished repairing a 18year old camper for hunting. As it was stick&tin, it was pretty easy.There was much insulation to worry about,either.
Out trailer is a wood framed composite. It's light like a Sherman tank is light. The newer aluminium framed ones are much better that way.The aluminium framing technology is fairly new as such there some learning to do. It's easier to screw up then nailing studs. But I think aluminium framing should be better, the wood they use rots almost instantly. Two years in and I replaced some of our wood. The lesson there is ,after two years replace sealant with some that works.
What I really like about the composites is that when done right, one side is one strong rigid bonded piece. Well insulated too,as much as 2" of Styrofoam.That even adds strength.
Polyester resin doesn't stick to wet wood. I know this from experience with boats.
adventure before dementia