I travel 2-3 times a month. LA, NY, DFW, Montreal, Atlanta, Orlando, Baltimore, etc.... I like to hit up food trucks. I can say I have never associated a food truck with "cheap eats". It seems they are on the expensive side, and I figure that is for the so called conveinence. If you find a food truck with a good reputation, they have usually tweeted our their location and a line will form the second they pull up. I have gotten great food, so so food, and bad food before. Or maybe the bad food was good, and I just didnt like it? Not sure. Either way, I would not aim to be the low cost provider. I would offer something the public cant get on every corner, and have them pay for it. Another thing I see often is that they have scheduled routes Monday through Friday. You can usually see the same trucks set up at larger office complexes, or manufacturers on the same day each week. Here where I live they rotate through Research Park during the week, and then set up at the local craft brewers on Friday/Saturday nights.
Sounds like it could be a fun adventure, so I wish you the best of luck.