Dude this is actually a pretty good date move, not many people do this. The right truck with the right food makes a killer date, though it will put off some girls. Though I'm ok with that cause I like a girl that can be down for just about anything... date wise I mean.
Depends on the date. If it was a fun date and we topped the night off with tacos that would be a hit. Buuut if we dressed up, hit a taco truck then went to see a movie or a play is feel like hmm. Certain dates call for actual dining while others are okay to be casual.
Nope. I'd be happy that I am going on a date. I don't have high expectations. I also don't expect men to pay a lot for me. A first date is just getting to know each other anyway. Most people I know usually do coffee dates as a first date. I like tacos too.
Hypothetically if I could still eat anything I wanted: No, I wouldn't be mad. I actually like tacos and if you knew a new place for me to try, that'd be cool. We could grab them and find a place to sit or slowly walk or something.
No, I'm not picky with dates, especially if it's a first one. I'm not a big taco gal so there might be an issue there, but a food truck in general, no that's not an issue. If it was like an anniversary, I might be a little bothered but first dates should be chill.
In my experience, it's not what you do, it's how much fun you can have doing it. That's why I prefer an active date. You're there to get to know each other, not to impress her by spending a fortune. As a guy who's paid $2 for hot dogs on a successful date, I say go for it!