This is a common marketing practice; magazine subscriptions are the best example I can think of now. A reduced price to attract the customer and let the customer see if he likes the product. The price goes to the regular price the next time around. GS offers a reduced price if you sign up to more than a year. I think a 3 year term came out the same as the intro fee on a yearly basis.
I have recently added RV coverage to my already existing AAA Plus card. Not that expensive as things go. I have had good luck with AAA, but have not used it for my RV yet. To hedge my bets, I also enrolled in the Good Sam ERS program and got a great deal for a three year contract. We'll see how things go when the going gets tough.
As previously stated, since GS ERS covers all vehicles and the MH I don't need AAA however, I do have the basic AAA membership for the discounts like Lens Crafters and Disney's Fort Wilderness. I easily save a couple of hundred $s per year using the discounts, after paying for the membership.
We have the GS Platinum ERS. It covers everything (cars and RV). We've had AAA before, but the only advantage to us was the travel books. There was a AAA branch near us back then, that we could pop in and get one. Not the case for us anymore.
Ford gives roadside assistance for a period of time when you buy from them. We have used it for a flat tire before.