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Motorcycles are difficult to load into pickup trucks. They do not transport easily. Standard wheelchairs do not stow in trunks easily. With self driving cars, more disabled people can travel. Bringing the low load floor all the way to the back of the vehicle allows both occupied wheelchairs and motorcycles to be pulled into the vehicle using the motorized wheel chock. The rear suspension anchor points are patterened off a Tesla Model S. The rear casting shown in red ties those loaded suspension points to the trailer hitch transorming the rear of the vehicle into a truck, with space for a wheelchair or motorcycle. There is room for a motor on each side of the loading platform. It is likely easier to use a different motor on each side than to engineer a limited slip differential into the transverse tube. As I recall the concept was a spinning shaft with an electromagnetic clutch that couples the torque to both, or either, of the two rear driving wheels. The hardest part of assuring that the dual motor design would work was obtaining enough length on the green half shafts to meet the manufacturers tolerance for drive angle as the suspension traveled through the entire range - while leaving room for a wheelchair, or DIN standard pallet, to fit between them. Controlling the noise produced by the drive elements mounted to the casting walls would also present an interesting challenge.