I could see this being a solid career. Probably make over $250/day cash and the time would go by pretty fast. Carts themselves are only about a grand. Then just hot dogs, buns and condiments. Triple the price to sell them and you would make so much money.
However where do you keep the cart at night?
You would need to rent a parking spot and those are very expensive in NYC. or storage again not cheap. also you could buy an old truck and an old trailer and transport it out of the city each day. but gas prices and tolls would get you there.
Im looking at rentals in queens right now. a place that has some free storage. get the cart wheel it out around 10am stay on the street corner until about 6 pm. all profit and no taxes
here is a cart for $1,100
seems like one guy could push that around a few city blocks. im going to do this i already have over $4k offshore and more in the bank. would only be a few months until i made my investment back