With spring in full swing and summer on its way, food trucks and outdoor dining are returning throughout the country. 

And while food trucks — and the idea of selling food from vehicles — have existed for decades, the modern iteration of the food truck was invented in 1974, according to the website for King Taco.

Amid naysayers, Don Raúl and Doña Lupe purchased an ice cream truck and converted it into a taco truck in Los Angeles. That summer, "Raúl and Lupe stationed their taco truck...

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