Does anyone have an idea of how common or uncommon it is for the parks to run out of scooters? My Dad needs a scooter in the park, but we are wanting to do a few later days this trip, and not get to the parks until late morning. Although he really should have a scooter at the resort, too.... he refuses to rent offsite. Are we going to have issues getting a scooter in May, or is it rare that they run out? Thank you!