A folding wheelchair will fit, the boot goes back quite a way but is rather flat, unlike the Yaq. The question will be if the scooter can get through the opening, if that happens the rest will be a breeze. I’d say take both with you and try them, to be absolutely positive.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark