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Just put it on a skate board. 
No it wasn't the side-to-side or forward-and-backward motion that needed isolation. It's easy enough to control that based on your driving speed and acceleration.

It was the vertical motion (bumps, potholes, etc).  I was going to build a platform on spring-damper supports, but (1) the necessary spring damper coefficients vary a lot with the weight of the cake and (2) it's tough to find and by a small quantity of small springs and dampers.

 
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