I think I've seen an ice cream truck maybe twice in my life. Once it was parked outside the junior high near my house and once I saw one parked next to a park. But I didn't buy anything either time (for one of them, I was already an adult, and the other, I was a kid and had no money).

I think they're more of a suburbs thing maybe, at least for that sort of driving around the neighborhood waiting for kids to come out of their houses thing like you see in fiction. It doesn't make as much sense when you're not cut off from everything and anyone can just walk or ride their bike to the store to buy ice cream anytime they want.

(I have seen Mexican ice cream carts plenty of times, though.)