Date registered: Jun 2009
Vehicle: 1991 300E
Location: Maryland's Eastern Shore
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This may be a question MB-USA may not care to answer as it might be seen as a disservice to their other dealers.
I grew up with a father involved in some of the major auto repair franchises in the country, both as a senior exec. in the national franchisor's headquarters and as a franchisee owning a couple shops--much better money owning. In each case there was a weekly newsletter to franchisees listing the top 25 by volume and dollars. The population of that list was very consistent, but absolute rank would change constantly. If you have a friend at a dealership they might give you a peek at whatever sales bulletin they get.
I don't think you're going to find the answer to your question easily. An extensive Google search didn't give me much, but I believe you've got the right geography more or less.