It is much harder on an aluminum sided rig vs smooth surface like Filon/gelcoat.
I'd try a small obscure area first and see how you fare.
Just alot of edges with ribbed aluminum siding and the powdercoat/surface is softer/more susceptible to scratches than smooth gelcoat.
I've removed plenty of decals new and old off of painted vehicles and smooth fiberglass campers.
Things like eraser wheels burn easier on aluminum and it's less resistant to stronger solvents IMO, based on my Al sided other trailers.
I generally make liberal use of heat and a razor blade. Again, tougher to scrape on Al. But there are sharp plastic scrapers or "razor blades" available now haven't tried them yet. Peeled a whole truck's worth of paint with razor blades and heat gun/torch though, recently. Heat helps.