I have a question regarding the length of stay rental. How does this work? We are staying for 6 nights, but would only need to rent a stroller for 4 park days that we are doing. Do they base the length of stay on how many days you tell them you want it for or your KTTW card? Sorry if this is a dumb question, but we haven't rented from Disney before and I don't want to drag our full size stroller from home. Heck at this point, I don't even know how much DS4 will ride, but we definately want the option to have one for him.