I have been working tent locations for two years. I wish that I could have asked advise from you guys before I started. Instead, I learned the hard way. One time I got city license, bought new tent, paid $300 first months rent, but did not check with zoning board before I started. After one very profitable week in business, the zoning officer shut me down. So, I learned from mistakes. Overall, I am very happy with tents.
The one thing that I did not anticipate facing was boredom. Out of an eight hour work day, there will normally be at least four hours of down time. Some days I am busy continually, but most of the time there is a lot of time spent waiting for someone to stop. That almost made me give up the tents, even though I average 30+ cars a week.
Now I have learned to bring some other project to work on while I wait. I bring hobby projects that occupy my time and cause me to move around, not just sit in van and wait.
In addition I ask customers to come back in a month or so and let me inspect the repair. First, it shows them that I am interested in their windshield. Second, I sometimes find a new chip to repair. Third, it creates the illusion that I always have a car under my tent. It's kind of like when you pass a resturant that always has a lot of cars, you assume that the food must be good. When people see a lot of traffic at my tent, they assume that I do good work. And they are right.
Excuse my rambling, but my point is, anticipate the down time inbetween vehicles and plan something to keep you from getting bored.

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