The tallest I've ever transported is a 3 tier so I don't know if this will work for all cakes or if there is a height limit. I bought one of those rubber shelf liners at Target. I cut it to fit the back of my SUV and put the cake on it and that's it. It doesn't move at all. I'm still careful with the corners and the brakes. HTH.
There is this SPS system you can search for on this site. A lot of people use it, it's a way of stacking cakes so they won't fall apart when transported. It looks really cool, but I don't have it yet.
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