You should rent an
ECV. Yu are better off renting from off-site so it will be available to you at all times (and it costs less than from Disney). Some information for off-site rentals are:
Here are the urls:
Care Medical:
http://www.caremedicalequipment.com/
Walker Mobility:
1-888-726-6837
www.walkermobility.com
RANDY'S Mobility is in Kissimmee 407-892-4777
http://randysmobility.com/
Colonial Medical
http://www.colonialmed.com/about_cms.html
I have used Walker a few times. They will ask for a credit card and charge it the day before arrival. They will deliver the ECV to your hotel bell services before your arrival and pick it up there after your departure. Their rates, especially for longer than a week, are much better than Disney's. Also, their scooters are much better.
You don't say if you are renting a car or what. If you are using a car for getting around, the
ECVs break down into five pieces, the heaviest about 39 pounds. They take about a minute or so to take apart and about two minutes (once you are used to it) to put it together.
If using a car, you might also want to see about gettting a temporary disabled hang tag from your state. With the ECV you will want to park at the close-in medical parking since you can't get the ECV on the trams and Orange County does patrol the medical lots and issue tickets.
If you need an ECV, you need it and should use it. Many people do not realize there are "invisible" disabilities; if they comment just sweetly ask if they would like to trade health conditions sight unseen.
Good luck and let us know what finally happens.