We are probably not going to win a special art award but this strange thing in the trunk is holding the spare wheel.
It has a quick release belt to fasten the wheel and it does take almost no energy to position the wheel. (once lifted over the edge of the trunk..) The petrol tank and the fillercap are also fixed with this strange object.
We now only need to find a jack to lift the car when we need to change a wheel on a stage.. We are not sure we’re going to find one in the store so probably we’ll build it ourselves.