Basically, that's a wash and wax job, with Scotchgard sprayed on the fabric and Armor-All on the tires. Automotive dealers used to tack on the "protection package" as a way of getting more of your money in their pockets, until buyers got wise. Apparently your Airstream dealer is trying the same thing with trailers now.
The decision not to spend over two grand for an afternoon's cleaning and polishing is a wise one.
Engineering: Finding complex solutions to simple problems you didn't even know you had.