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You don’t need the grill to make tacos at least you don’t need it while you’re moving.
You could make all the proteins and prep all the cold stuff ahead of time. You could run a generator and generate enough heat to keep shells and proteins hot, ice for the cold stuff.
I have absolutely think you could sling tacos from a moving platform.
The biggest problem in my area is they hardly advertise. There are plenty of taco trucks out there but it’s basically word of mouth or following their social media, and their social media isn’t even written on the side of the trucks half the time.