To be fair to the EV industry, as a whole about 1% of the US population are in wheel chairs of some kind (if my googling is right). And some of those at any one time are temporary after some medical procedure. And some, for example are elderly and can stand, but not walk long distances.
As you know, there are many levels of being in a wheel chair, too.
I did have a elderly family friend who passed ~year ago at 95. I was able to get her out of the chair and into my Tesla and put the wheel chair in the trunk, no problem. She was still doing most of her own yard work until about 92.
So I have no idea what percentage need a van, like you (Peter), but it is less than 1%. and no reason to even try and move to an EV van as an early adopter – the CO2 savings and initial cost don’t really make sense…yet.
More googling says that the total market for wheel chair vans is about 40K/yr compared to 18M cars total…so about 0.2%.
Mike