Forty percent of respondents in the survey said they don’t believe food truck workers should be asking for tips, even though it’s common to see a digital tipping screen when you pay for your food. Default tipping suggestions can be customized. Sometimes you’ll see options like $1, $2 and $5. Sometimes it’s more like 18%, 20% and 22%.
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When I was in California, I ate off taco trucks at least 4-5 times a week, and they were always a cash only proposition, no cards, pay up front.
Not that I'd have used a card even if they did accept them - there's no way in hell I'm willingly giving my card info to a bunch of illegals.
I don't hit many taco trucks around here only because we don't have any real Mexican food taco trucks here. The only taco stand we have here in town is basically a glorified Taco Bell and all the ones I've checked out in Portland and Gallatin cater to the White folks, and Tennessee people don't do anything spicy. Basically you're getting fried meat that was cooked with no flavorings at all on a tortilla with some onion, tomato and cilantro to give it a little taste and make it look authentic. Myself, I need to feel my Mexican food as well as tasting it - by the time I finish eating, I should be sweating and refusing offers of medical assistance from concerned onlookers.
Hell, the carne asada or chicken tacos I make at home are better than anything I've bought from a taco truck here.