1918 15-ton Couple-Gear gas-electric powered tractor-truck by the Couple-Gear Freight Wheel Company of Grand Rapids.

the middle guy above, seems to be in the drivers seat below

From 1918 to at least 1922 Fageol designed trucks to replace the mule trains that were then hauling ore out of the mines of the American Manganese Products Company in California. They experimented with different combinations of axles and drivetrains, including the Couple-Gear chassis, which appears to have been the largest. In the end they settled on a Fageol designed six-wheel-drive 10-ton truck towing two 5-ton trailers, built by the obscure Rogers-Unit Drive Corporation.

http://www.shorpy.com/node/20990  and   http://www.shorpy.com/node/21034
thanks Steve Z!