You can use the SPS support system. Folks here in CC swear by it. I would make sure I have a dowel that goes through all the layers. But ultimately you are at the mercy of the bride's driving. I know if you were taking the cake you would drive it like if you had a baby on board.
^^^ what ropalma said. Also, take pictures and MAKE SURE that you have the bride/whoever sign off when they pick it up. You CANNOT be held responsible for the condition of the cake once it leaves you. And make sure they place it flat (not in someone's lap) and give them a square of the rubbery shelf liner to set it on so it doesn't slide.
Yep, agreed. Use SPS and make sure you tell them to drive carefully, keep the car cool, etc. and have them sign off that they're responsible. For this reason, I actually require all my wedding cakes be delivered and set up at the final destination - by ME! Good luck!
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