I think the effects of road salt will initially be more cosmetic on aluminium but this in itself is a form of corrosion. You would need a less porous stainless chassis to be confident of use on our winter roads. Engine block and alternator housing show up the surface corrosion on aluminium as soon as the first winter of use with white flecks.
Land Rover developed an aluminum sheet variant they called Birmabright early in production which if my near 60 year old example is anything to go by survives well. No idea what MMC use. Galvanic corrosion near dissimilar metal fittings can be another issue probably increased by salt.
