kb3csw, if I'm not mistaken the name you referred to as "tructor" was really Truckstell and was born in the NW Pacific area in the 30's. Your correct in your statement that it was a product to add live power to the newfangled tandem rear. I had a former customer whose father was one of the first dealers of this. It was widely sold in the logging industry before the advent of factory twin screws.
Incidently, tag axles are still manufactured to make a non powered tandem. I've installed many of them.
