Startup Idea : Self-Serve Yogurt and Ice Cream Delivery Truck

I've seen ice cream trucks around town, they honk a horn and come in the neighborhood, but never have seen a self serve yogurt or ice cream delivery truck. There are a few self-serve yogurt shops in my area that have just started up. It would be interesting to see if they could come around and delivery the self-serve on a truck every so often. It could be a good way to spread the word about the self-serve yogurt shop.