I had a friend in Argentina, a trained chef who worked at several restaurants in Palermo. Tired of the long hours and medocre pay in someone else's kitchen, he started doing home delivery / catering using a small truck he purchased. Not only did he get stopped by the police, truckers union (Moyano) for not being registered with the truckers union, the food was confiscated and they threatened to impound his truck, and when he made some mozzarella / tomato / basil sandwiches to sell at the street fair in San Telmo, he was threatened by other street vendors and told by some other people that he had to pay the equivalent of "street rent" to sell there. Maybe this is why more people don't venture out on their own in food carts. Argentina is "unique" when it comes to doing any type of business.