I always like to ask people: What’s the mission?
Is this a neighborhood truck driving around playing Turkey in the Straw? Or do you want to set up with food trucks, maybe both? Does it have to be a “food truck”, will a trailer work? I live in Atlanta, I see a food truck broke down once a month at least.
What kind of ice cream? Soft serve, hardpack, fried, pre-pack bars
How is it going to be served? Cones, hand made waffle cones, sundaes, floats, shakes, malts
What other menu items? Soft pretzels, soda(fountain or bottled), bags of chips
I used Legal Zoom for my LLC. It was $100, it worked for me and my situation. The 2 actual lawyers I called wanted $350-500. For the state, it cost $50 to register my name. The local municipality may also have their hand out, too. Also along those lines $15 for the web domain. I think it was $75 for the ServSafe Manager certification.
The truck price range varies depending on the equipment you actually need. If you are just rolling around selling Dilly Bars out of the back, all you need is a freezer. If you are making fried ice cream, then a deep fryer is now involved. Plus, all the stuff to make the batter and storage of said items.
Some things to think about.