Not with just a single truck, probably, but a fleet of them with prime locations (like outside major tourist attractions on a hot day) and selling a premium offering for $8 per ice cream? You could probably make pretty good money doing that, especially if you have some kind of secret recipe (sprinkle some crack in every pint!).

You can become a millionaire by scaling up almost any business. I doubt you’d become a billionaire but who cares?