Could one install unfoldable solar-surfaces, to increase the input are while parked? Its additional weight and motors after all. In theory though, a car could i

Could one install unfoldable solar-surfaces, to increase the input are while parked? Its additional weight and motors after all. In theory though, a car could increase the surface it has to the max allowed volume area of the region? In germany that would be 2.55 m * 12m - thats 30 m^2.