From the little he wrote, I think @michaelfdavid is prolly in the idea stage.
My take? Building a business out of food trucks, as with all other food related businesses, could be quite lucrative. Depending on the area Mike decides to cover. If you end of getting a fairly used truck, you might spend more time servicing the truck itself than the food.
Scaling might be a bit capital intensive, as this would involve getting more trucks to cover more areas. You should also make sure your food is top notch. How you'd retain food quality when you eventually scale, is something you may need to figure out... But hey, what do I know..
All the best bro.