I don’t think what you are thinking about is possible for our site since we are a truly international group with members all around the world.
We do however have two areas that you may not yet be aware of on our site that may help you to fulfill your need.
One is our “Member” pull-down menu where you can locate Members in your immediate area
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https://www.sl113.org/forums/index.php?action=mlist;sort=location;start=0And
The second one being a “Vendor” forum section where you can find shops that you may call upon if need be.
Here ——>
https://www.sl113.org/wiki/Suppliers/StartAs for the Members area, you can open the “View Member Listing” this database you can sort by “Location” (the link above is sorted for you by Location), once done so you can Page thru the database until you found your state and see Members in your area or State. Some of the Members are not very active (they may have joined just to have access to the Benefits that our site offers). Nevertheless, you will be able to contact them by e-mail (PM) and find out what shops or Mechanics they are dealing with if need be.
A third way would be to let Members know your travel route (listing States and or major cities along your route). You can start a thread if you wish like “Planning to travel from Chicago along Route 66 to LA” then in your thread ask what shops or help would be available along the way if the need arises.
In the past 5 years, I’ve traveled over 12,000 Miles in my nearly 50-year-old car. I just make sure that the car is in good shape and so far I only had 2 issues one being a loose windshield wiper and the second one being a failed fuel pump fuse. The first one my toolkit screwdriver took care of it, the second one was very costly mainly due to to the lack of knowledge on my part ... it ended up being towed to my nearby Mercedes Dealer the tow truck driver damaged my radiator during the loading that’s another story, therefore it ended up very costly.
As a last resource and I know it will be costly I recommend you Google Mercedes Dealerships/Shops or Euro Automotive Shops along the way you are planning to travel.
I hope this helped you somewhat, safe travels!
Dieter
Edit; corrected some typos and grammar, the problem is sometimes I think in German while typing LOL