They were work trucks so most people proably refered to them by their set up as opposed to model designation. Example My first real driving job the boss would tell me to take the trailer or take the tenwheeler depending on the amount produce to pick up never refered to model. On current job they may say to take the day cab no mention of model.So likely if folks grew up refering to a truck by set up or capacity thats the way they would list it. so use Spanky's info to help figure out what the ad is for. Thru the fiftys and in some cases later folks would buy a single axle truck and then add to the frame and install a tag axle to increase capacity. Spanky has or did have a tandem set up called tructor I belive which allows both rear axles to pull befroe the advent of the now common twin screw.
