One used to come by on a very non-regular basis when I was growing up and it was always a treat. My parents usually let me get something, although to be honest, I think I knew even then the ice cream they sell is not very good.
Flash forward to now: There is a very annoying and creepy looking ice cream truck that patrols my neighborhood daily in warm weather blasting "Turkey and the Straw" at high decibels. Only Turkey and the Straw. It lasts about 1/2 hour daily and it drives me crazy. If I had a napping LO I would be furious!