Yes. Aluminum boats are a Pacific Northwest staple, and we weld hulls, transoms, decks, ladders, rod holders, and the seam welds that hold a boat together. Aluminum trailers are common for utility, dump, and equipment hauling. RV components like hand rails, ladders, awning brackets, and steps round out the most common aluminum work.
Each category has its own quirks: boats need clean, watertight welds, trailers need structural penetration, RV components need to match the existing finish.