This is a sandwich food cart in the parking lot of a produce stand.
So, while the sandwiches can’t be gluten-free, their tots and fries are made in a separate fryer. They sent me ingredients images - potato ingredients and packaging indicate gluten-free. The seasoning is McCormick Seasoned Salt and though “natural flavors” and “spices” are listed, the McCormick website states that they do not conceal allergens.
And there’s fresh fruit right nearby!
From the owners: “Yes please share, that would be great! We certainly do everything in our power to avoid cross contamination. With that said we are a smaller truck so I can't make any guarantees that it never happens but like I said we do everything we can to avoid it!”
— No gluten-free information on the menu