As per the original question, there are so many variables, but a one person operation, with a well planned and well financed marketing and advertising plan should be doing at least 30 mobile repairs per week. Past this level, the paperwork increases to the point where one may need a mate to aid in accounting, telephone answering, scheduling,etc.
I know of noone in my sector that utilizes the temporary (tent or awning) approach but it is intriguing.

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