I moved to a new location and I have doubled my sales. Before I was at a good intersection with easy parking doing about 3 dozen dogs between 11am and 2:30pm.
My new location is on a corner across the street from a major hospital on one side and the VA hospital across the street on the other side. There is a parking garage on my corner for both hospitals. I am selling 6-7 dozen dogs each day now. I am already getting repeat customers within the first few days and they tell me that they are glad I am there. The foot traffic and parking garage is the key. Plus, hungry customers helps. They get tired of hospital food pretty fast.
The city zoning people ran off a;; other carts. But since I served them with with a 42 USC 1983 civil rights violation service, (I served the mayor, the head of the zoning department and the zoning enforcement official with notices. The city can’t be sued, but the officials can be sued for damages personally!) they have been leaving me alone. Their worst nightmare is a pro-se person that knows the law and car write a legal brief.
So, try some hospitals. Check with your zoning people first to see what you are up against. In my state (NC) the Right to Work law is very strong.