Wheelchairs at the resort are really intended for those who have an emergency while on vacation, not guests who know they will need one. There is limited supply, so one may not even be available. And as you found out, what is available may not be the right size or in very good condition. The best advice is to rent from off-site if a person anticipates needing the wheelchair for the length of the vacation. On-site at the parks is good if you ONLY need it at the parks, but those long walks back to your resort room at night can be a killer after a busy day at the parks.