They simply look at several, figure out how they are going to use the vehicle and then get down to the basics of color selection and negotiation.
Warranties are fairly simple, as well as insurance.
Government regulations usually protect them against an unsafe vehicle being manufactured. A119.2 Recreation Vehicle Standard. The confusion arises when you don't know what you are looking at, let alone what you want to buy. You will quickly discover that all the decisions are yours. My only role is to provide you information and published resources that allow you to make an informed decision.