If you need to disinfect a brand-new Airstream, then you've got some issues that an extremely overpriced product won't resolve.
All joking aside...based on my experience in the automotive coating and fluoropolymer coating industries, the claims that these products make are insidiously dubious. The aluminum on your trailer has a fluoropolymer layer (something akin to Teflon) which is relatively resistant to dirt, oxidation, and light abrasion. It is more durable than any coating that can be rubbed onto the surface.
The only function of this product is to increase dealer profit at your expense.