Is it possible to transport a 4 tier stacked wedding cake with Bc frosting sizes 18-14-10-6 in an air conditioned minivan in August for a 4 hour drive without sagging of the tiers? It seems like all the bumping in the car will make the filling sag even with good dowel supports. Anyone have any advice for the travel "Leary"?

SPS! I transported a 5 tier stacked wedding cake with bc in a minivan (6-8-10-12-14). Although it was only a 30 minute ride it worked great. The biggest problem you'll have is moving it into the van & out of the van into the reception......HEAVY, very heavy. I had to very strong men handle that & they were more nervous that I was. I wasn't worried a bit using the SPS system. It was wonderful!