BMW build 2800 HP2's and even though these bikes have incredibly capable suspension, they are really lousy to use for touring, the 13 litre fuel tank does not get you far and the complete lack of fairing does not allow the rider the endurance to carry on riding all day long. It was also not provided with any means to carry luggage.
KTM's Adventure models were probably getting closer but the suspension was compromised to allow for a more comfortable ride height for shorter riders and to cope better with road handling at speeds in the access of 200km/h. The bike is overly complicated and even though the 950 used carbs, a fuel pump needed to be used as the bottom of the fuel tank was lower than the carbs. The same can be said for the BMW's, they are very complicated because of fuel pumps and other electronic components regulating fuel injection etc.

One small manufacturer prevailed though and they are hand-building the ultimate off road tourer based on the R80 and R100GS models from BMW. These bikes fitted with proper off road suspension on reinforced frames allow the rider ease of maintenance in the most basic workshops around the world.
Fuel supply to the carbs is good old fashioned gravity feed and when this brake down you know you are screwed real good in any case.

The following links have lots more info.

DIY your own bike, the HPN way.

YouTube - BMW GS by HPN; RIDE THE ADVENTURE

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