I think you may be assuming more than the facts: the RV industry, it's manufacturers, don't have a 'hold' on dealers to do anything, including warranty work.
There are 'authorized' dealers for warranty work, yes, for certain manufacturers, but those dealers are simply authorized because they have agreed to abide by the manufacturers set 'hourly rate' when billing them for warranty work, and the set number of 'work hours' for that type of repair or replacement. They have more free-will to take care of the work without having to get 'authorization' from the factory, first.
Other dealers, or repair shops, or mobile services, etc, who are NOT 'authorized' dealers can still perform any warranty work, they just have to call or contact the factory and first have it approved. It works no differently other than that. The factories can't demand that customers 'only' use their authorized dealers, but generally the work proceeds faster since the dealer is already 'pre-authorized' to do it.
Whether warranty or any other repair or service, any dealer can do things as they wish. Some may even sell RVs and have NO service center to do any work - they certainly are under no 'obligation' to provide warranty repairs, even to those RVs they sold.
__________________
|