Found this on Hemmings. Yes it was Butte. The puzzles were great so was looking for the 4 dots on the back side of Oly labels.
"A pair of Chevrolet 235 cubic inch sixes, complete with separate transmissions and producing 93 horsepower each, could be operated in single or tandem configuration. When running together, the two engines were roughly synchronized by a vacuum-operated governor, or the truck could be run on a single engine when unloaded to save fuel." https://macsmotorcitygarage.com/twin-engines-and-eight-wheel-drive-the-eisenhauer-freighter/
I believe it is. But, like so many companies making the slog to the 21st Century, not recognizable from their early 20th Century form.