If you click on where it says "disABILTIES" at the top of this page it will take you to the Index. One of the top items is the "disABILTIES FAQ" which will gives lots of useful information. Post #2 give detailed rental information about both wheelchairs and ECVs.
Or, if you want an easier route, click on the link in my signature.
If you get your doc to write a prescription for it, you may be able to get your insurance to pay for it and pick it up from your local med supply store and have it with you from start to finish. My doc has written a scrip for 2 rentals now.