When I saw the vehicle above in this Siku catalog (where I got the pictures from), I was very surprised. To the best of my knowledge, Siku never made any fantasy scale models. I just found out that the Volkner Mobil Performance is an actual vehicle.
The middle garage is a hydraulic drop down-slide out vehicle cargo bay.
A wall-out expands the interior space. The model has a scale of 1:55.