[Dave]

Does anyone know if someone from this forum or one of the big parts suppliers has ever formally requested suburban quarter panels to be manufactured?

I realize that this would a significant investment, from engineering to manufacturing and the ROI would certainly have to be considered. What I'm thinking here, is a full length quarter skin that goes up to the window area and stops short of the tail section. As the tail section is already available, thus it might help keep the cost down.
With entire truck cabs, bedsides, floors, etc., available now, I'm thinking there's definitely a demand for such a product. Finding good usable suburban quarters off a donor vehicle for folks who need them, simply isn't an option anymore.