As long as they can be VAT exempted, which I assume they can, then I guess there’s nothing stopping them being considered. However, my hunch as to why they haven’t been included to date (and most likely won’t be in the future) is probably more to do with the chances of such vehicles being abused (i.e. used for unauthorised reasons) being much higher than it would be for other vehicle types. I suspect that Motability are concerned about the PR damage that would occur if a builder, or similar, was photographed loading up his “free Motability truck”!