Dont feel bad. A guy drove his brand new ferrari to the house last year to pick up a 3 tiered cake. I told my wife it wouldnt make it down the street. No matter how you brace a cake for transport theres always that chance somethings going to go wrong. So far it hasnt been an issue but you try to tell everyone "its a cake, be careful". You would be surprised how many people just go bouncing out the door with them like its nothing.
For the record, I dont want to take anything away from my wife, I dont have anything to do with any of these cakes, these are all her. I do what little I can to help with cleaning and supply shopping but thats it I am usually just in the way or distracting her. lol