Why not develop an axel with an integrated motor? It’d be easily scaled to any vehicle with a solid rear axle. Fill the engine bay with batteries… It seems like an easy approach to get a widely applicable EV conversion kit. Offer a few widths and diameter axles… Is it bad to have the motor in an unsprung position?I see hub motors, so I think not. I guess air conditioning would be another thing.
A diff head replacement EV motor would be an interesting idea. The amount of unsprung weight would be less than ideal though. It’s probably a better idea to have a motor that sits in the trans tunnel and connects to the transfer case.