Some food trucks can rival restaurants in big cities — pulling in millions of dollars in sales a year, although they are a minority. It's not uncommon for popular food trucks in major cities to pull in between $20,000 to $50,000 in sales each month. Food trucks in smaller, more mid-sized cities likely make considerably less at $5,000 to $16,000 a month.

Food Truck Empire asked 223 food truck owners in Florida, New York, Texas, Oregon, and California about what their annual income from owning food trucks was like. 21.52 percent made over $200,000, 30.04 percent made $150,000 to $199,000, 34.08 percent made $100,000 to $149,000, 10.76 percent made $50,000 to $99,000, and 3.59 percent made less than $49,000.

On the other hand, when food trucks owners were asked what their best day earnings looked like, their highest daily income was around $8,000, but they admitted it was unrealistic to expect that much in one day. Although, starting and keeping a food truck running isn't cheap and there are additional costs, making a good living with food trucks is certainly doable.