Don’t know if you seen the video of a older double duty on turnin rust.cool trucks
Yup, saw it. Pretty big change in ten years! I can't remember where I saw it, but GM didn't want Boyertown changing their Dubl-Duti chassis to forward-control, in the early years of the model. That's supposedly why there are fewer than 100 made prior to '47! Ford, Dodge, etc didn't care and actually adopted the FC-type chassis a little later, for regular production.
I was really impressed that old 216 fired off as easy as it did! Not surprised, per se, but impressed.