You can see the video. When I moved the medium planter to transport it on the roof of the Jeep (SUV model) the vehicle immediately wigged out. Removing it immediately stopped the vehicle from wigging out. I put another object, a plastic water barrel on the roof. No problems. Replaced it with the medium planter once more, and the vehicle wigged out.
The medium planter and Jeep (SUV) transport bug using the vehicle's hook point (roof). When you placed the medium planter the vehicle immediately wigged out. It would not be able to be transported in this state. I moved a water barrel on the hook point and it was fine.