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Just did a quick check and see that the ACA described the GDMBR as:If that's a good description and the single track is both a "dash" and not too tightly wooded or hemmed in by rock walls, then the 1200GS is a suitable machine.
"The big, bad granddaddy of epic mountain bike routes. 2,700 miles of primarily jeep roads (with a dash of pavement and singletrack)"
That sounds like what the GS and KLR were designed for.
It would be interesting to know the type of motorcycles the above posters saw on the GDMBR. I suspect most were 250 to 400 cc single cylinder relatively light trail or dual purpose bikes.
The BMW 1200GS you ask about is a very large, very heavy motorcycle of the type called an "Adventure" motorcycle and mainly intended for dirt roads and similar, not single track trails. Along with it's legality you might try to determine how suitable that particular motorcycle is.