In the early days of the nation's interstate system, as people set out on long road trips, it became a popular notion that if you wanted to find good food on your journey you need only look for the cafes with the most trucks parked outside. Whether it was true or not, travelers assumed that truckers knew where to find the best food. (In that regard, they were the precursors to present day Yelpers.)
You won't find a lot of trucks parked outside Truck Stop Pop-up Kitchen, maybe one at the most. For one thing, the narrow streets of Thornton Park aren't suited for 18-wheelers. Also, the concept for this new restaurant is that on most evenings the kitchen is taken over by the operators of a local food truck, giving them the opportunity to cook in a kitchen not supported by rubber wheels and to have their food presented by servers to people sitting at actual tables.
The innovative concept is from Greg Peters, who founded the Graffiti Junktion chain. In fact, the first GJ opened in the same spot in December of 2008. The Graffiti Junktion concept of burgers with an attitude caught on, and as other locations opened, the original outgrew the space on Washington Street. So it moved down the block after Wildside BBQ moved out in August of 2016.