Thanks for the advice. I’m actually leaning towards renting in the park now. I forgot about the elevator at the GF. DH backed it in or out when we were there. Then I was wondering how I would get the ecv in the room if I was alone. I have a bad back and knee so I cant bend or pull. Worst case I will try to rent offsite when Im there if the parks are out of rentals which I doubt will happen. I Will request a buikding near the boat launch to get to the MK easily. The Epcot monorail ramp is tough but I could borrow a chair and have my kids push me or call an Uber if Im alone. I must sound like a big baby but I tend to get nervous easily.
As
@kaytieeldr said, the Resort launches at GF won't handle an ECV - and only can take a wheelchair folded (and I'm not sure if they still allow that, to be honest. Plus, you have to be able to manage the steps)
As far as "borrowing a chair" that isn't a thing anymore. The Resorts no longer have wheelchairs that Guests can borrow and the "courtesy" chairs that are supposed to be stationed around the parking lots often... aren't anywhere to be seen. Just trying to set a realistic expectation for you - I would hate for you to plan on using a resource that no longer exists.
As far as getting the ECV into the room when you are alone, you can carry a doorstop (or leave one inside the room) and then prop the door open while you slowly and carefully drive through the doorway. At GF there are nice wide interior hallways and lots of space, so it should be fairly easy. And you can always practice with family members on hand before you try it alone!
I know it seems overwhelming right now, but once you are there, and you have gotten used to the scooter, it's actually a lot easier than it seems "on paper"
When I used to think about using a scooter at WDW, I would get super stressed out; it wasn't until I had to bite the bullet and call to have one delivered (literally while I was sitting, crying, in the middle of Epcot) that I found out it wasn't nearly as much of a nightmare as I thought it would be. The other thing that happened - that I truly was not expecting - was that because I was in less pain, and because I had the scooter, I could now not only keep up with my family (and I no longer slowed them down as we constantly hunted for benches and chairs and shade...) but I could set the pace. I was independent in a way that I had not been at WDW in years. I could go get coffee in the mornings before every one was ready. I could pop into the shops if I wanted to, while my party went on to a ride or show.
Hang in there - you can always try an offsite rental, and if it's not for you, have them come and pick it up. But whatever you do, I hope you have a great trip