I am getting ready to move up to Rapid City and was looking at the annual state park pass. I was wanting to use it with my bike and my car. I don't understand if you can buy 1 and use it for all your vehicles or do you have to buy 2 seperate ones. They have one that is transferable but I don't know whats all involved with that. What do you guys get and if you don't mind what do the passes cost?