My nephew wanted a 'Mercedes Cement Truck' cake. Who knew that Mercedes made cement trucks? This cake was a near disaster due to the weight of the cake. The cab and base of the truck are all cake. The cement drum of the truck is RKT and I used two football molds (cut off the ends) to create the drum shape. Frosting is all buttercream. If you make this cake, make sure you have a well designed support system for the drum and don't drive too far with it!.