I own an RV rental company, so I am very familiar with this system. While this is a good way for you to make money - I would NEVER recommend buying a new unit to do this with. If you want to earn income from a leaseback program, buy a used Class C for about $25-30k cash for the program. Every market is different, but that would earn you about $13-$15,000 a year at my place. In 2 years your RV would have paid for itself, and the next two years is pure profit. Then you sell your RV for about 50% of what you paid for it and could potentially pocket $40-$50,000 total in 4 years.
Like others have said - make sure the company has the good commercial insurance that provides the insurance on the unit even for the renter - that way you don't have to worry about their insurance. Expect that small things are going to get broken and replaced, and your unit will not look the same after 4 years... that's why you would want to buy an RV as an investment to use and sell - don't do this with an RV you want to keep!