Vehicles for persons with amputations, physical disabilities or mobility difficulties; wheelchairs; robotic transport vehicles; wheelchair motors for driving wheelchairs; power-operated lifts specially adapted for vehicles for use with personal mobility vehicles; robotic wheelchairs and structural parts therefor; accessory attachments for robotic wheelchairs, namely, arm supports, head supports, thigh supports, and multiple-pocketed carriers for personal items specially adapted for attachment to wheelchairs