Stand-up scooter are tiny motorized scooter weighting from 50-100lbs. Your 200-lb moped will kill someone if ran into someone at full 20mph, that's why you need a license plate, dmv testing, etc. Some stand-up includes a bike seat, but the whole contraption is like a child's scooter, hence no plate/license/insurance/registration requirements.   You can probably ride your 15-mile range scooter after midnight, camp out at the DMV station when you arrive and wake up...