I have not seen vending carts that do chicken fingers (but that doesn't mean it won't work). Salads, I have seen a couple of vending carts doing salad in the downtown core and they seem to be busy, they have 3 or 4 varieties and a number of prepack dressings, the salads are prepackaged so the sale is quick. Cheese steaks require a grill, which can be placed on a barbeque, major problem is prep time, difficult to prepare in advance and keep quality level up. If you can solve that problem you might have a great idea.