I think the store front idea is great. If business is that good and it sounds like you have been offered a great deal go for it. If you can do it, hopefully the mobile and store front will each make enough of their "own money" that if one doesnt work out of falls off later you still have the other successful business in operation. The window tinting is always a good idea if you can offer affordable quality service. Even if you added that to a mobile line... would be cool. Some people may not have time to bring you a car if they work all the time. You could use one of the 10x10 quick setup canopy's to keep the car in the shade while you tint if its in a parking lot or something.
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