I'll take your money if you're throwing it away. A truck like this would thrive only on opportunism, no one is traveling to get this food. Having it be cash only would absolutely kill it.
Not necessarily. If it’s really good it could be a novelty but more likely yeah it’ll be put up near a bunch of low wage jobs in the daytime and near a bunch of alcohol selling establishments at night. Dirt cheap fast street food is a thing for a reason and there’s a reason it’s all basically this
Yeah my career keeps me in factories and there are food truck rotations at some. If Tuesday means there’s a $1 grilled cheese you bet your ass most people are looking forward to that cheap greasy sandwich all day Monday
Burrito trucks in the Silicon Valley. The proper one's, where the Mexican low wage workers go. I was on quite good terms with the Mexican custodian of the facility I worked at (in the heart of the valley), and he pointed me to some of the really good ones. Usually, the best bet is to find a construction zone, there'll be a few trucks out, depending on the size. The trucks are plain white (no ads or decals or anything), no billboards etc. And they have one thing usually (with a tiny bit of variety). Burritos (choose between three meats, get patatas or not), Tamales (literally just the one kind), etc. And they were all buck cheap. IIRC the burritos were 5 bucks (that was 2010/11?), and it was an unspoken rule that you paid in exact change.
The one burrito truck had a short stint on my workplace's campus, together with a Mongolian buffet truck (you went in the front, got stuff from the buffet, went out the back, weighed it, done) of similar shadiness, and they were a huge hit. The workplace soon however decided that those were not good enough (some regulations whatever), and over night they banned them but got in the colorfully painted ones with the punny names ("BBQeue - you get it? Because you stand in line for so long?"). Now you'd pay 15 bucks for half a sandwich and a cup of soup.
Yeah, I went to a Phish show at the gorge once and there were at least four cheap grilled cheese operations on shakedown street (their ad hoc, unsanctioned shopping area.) I don't think anyone was as cheap as a dollar, but they were close (3 for $5?) and none of them took plastic.
There were massive lines every time I walked by and the sheer robotic precision of the guys working the griddle was amazing. They had it set up so they were making batches of ~20 at a time, and new bread went on as soon as the last batch was finished. They were still going after the show got out.
So it's doable, but you have to be able to go where Phish fans are and tolerate them all day.