His doesn't have wax, so no worries about stripping it off.
"Doesn't need waxing" isn't the same as "Do NOT wax", so you can wash & wax and polish if you like. The Krystal Kote finish is supposed to outlast regular painted aluminum, but nothing lasts forever. Nor is it impervious to all possible chemicals and grunge that may be in the air. BTW, the aluminum siding on the Sunliner is painted with a baked enamel finish. The Krystal Kote is a protective layer over that, analogous to the clear coat used on modern paint finishes.
The Sunliner owner Club has some topics on Krystal Kote finishes that you might find helpful.