Abstract: A carrier platform transports motor vehicles to be manufactured through assembly, test and other work stations. The platform remains with the motor vehicle at the assembly, test or other work stations and enables free access to the underside of the floor-pan of the vehicle and to the contact areas of its wheels for checking and measuring loads that actually occur at these areas. Support plates on the platform for the wheels of the vehicle are fashioned so as to simultaneously function as safety devices during the testing procedure. When horizontally positioned the support plates engagingly support the four wheels of the vehicle. During certain tests these support plates are vertically positioned and function as safety devices.