Thanks for all of the history and background on these kits, I remember building many of them as a teenager and have a few of them in the stash in the garage.
I never was a big fan of the front suspension because as Casey pointed out, it ain't right! The MPC kit of the '78 2WD stepside was the closest to replicating a correct suspension.
If we could get a true new tool of this truck series, they could develop several tools including a medium duty cab as they aren't that much different. I do wonder how well the re-issued GMC with the snow plow has sold, I know I have done my best in helping them by purchasing/trading about 8 of them!