Dennis, from what my book says (there isn't a twin steer model in it), it could have had either twin Detroit 6-110's, twin Cummins NRTO-6-BI "turbo diesel", or one truck had twin Detroit V12's. All trucks in the book have Allison 4 or 6 speeds, some trucks have two trans. As for the model, it could be a 1LLD, 2 LLD, 3LLD, 4LLD, 5LLD, or 6LLD. Also a R-55, or a R-62. These all look the same as the Hake truck, but not twin steer.