ISO Souvlaki / Gyro truck that uses Charcoal, not gas...
I don't know, but I do know many parks do not allow propane tanks, charcoal only for patrons and food vendors (concession stands might do differently?)
I can try and find a cart, but I prefer a truck, if it exists. BTW, I guess I should mention that it is a Nassau County Park... in the TOH, if the license makes a diff...
Maybe one of those LARGE carts that are at least TWICE the size of those hot dog / pretzel carts...?