I have a request to make this wedding cake. The bride is wanting the tire to be a 12" round cake that will stand on a 12x18 sheet cake. Has anyone done anything like this before? Making the tire does not scare me, but standing it up with proper support does! I want it to be realistic, so I know it probably should be at least 4" wide, but it dosen't seem like dowels going up and down will give enough support and keep it from falling over? Also I am concerned about making it wide enough which will require two cakes standing side by side, so the support dosen't seem like it would be nearly as secure since the middle will be icing inbetween two layers of cake. She has requested it be chocolate cake (for the tire) Can anyone give me advice on the best approach at standing this tire up? I would appreciate any help!!