My b-i-l was an owner/operator, he made deliveries in the 48 contiguous states. His last delivery to N.Y.C. he had to go inside a business for 5 minutes, he asked a meter maid if he could double park his rig while he went inside for the 5 minute max time, she told him to go ahead. He was inside for less than 5 minutes, when he came back, he had a parking ticket on his wind shield, his side window had been smashed and somebody had stolen his brief case. After that he refused all deliveries to N.Y.C.
The few times I delivered to NYC I had a rule to never go in after dark. I would park in Allentown, PA and wake up about 4:00am and drive on in. I was driving back from a load up to Rhode Island to points south one night and hit NYC about midnight. I missed the G.W Bridge. Next place I remember was Harlem. I didn't let the wheels stop turning till I was out of Dodge LOL. I never felt safe in NYC day or night but I sure wasn't parking there to sleep.
I did have a security system though for when I slept. A good strong string that was tied to both doors and wrapped tight around my air horn cord.