If I rent a full size SUV and plan to use all 3 rows of seating will there still be enough room to transport an electric scooter in the very back cargo area that is 47" long x 22.25" wide?

Stick to a recognized rental company, I wouldn't go there

I have an expedition and i dont think the scooter will fit with all the seats up there is not a lot of room left

What they advertise for vehicles is not always what you get I was advertised a jeep Cherokee of which was what I expected but they only had Kia Sorrento which are lousy passenger vehicles An as adverized large suv in the rental world can be one size smaller according to there classifications I would recommend calling them based on your specific needs