Tell you another idea I have had. Backstory;
My BII is a 84, it has the aluminum trim around the side rear windows. Well apparently in some sort of previous accident the pass side window was broken. Found little bits of glass when doing my tear down, and someone put the later style rubber only window in it and did not do a very good job of it. It looks bad with some sealer visible on the outside, but it doesn't leak.
I have been searching, not very hard, for a 84 (maybe 85 also?) that would have the trim I need. Not sure if I could take the rubber out, glue the window in place, and put the new found trim back in to match the other side.
I said all the above to give the back story to me contemplating taking one or both of the side windows out all together. Filling the hole with a piece of formed sheetmetal, then cutting the center out to fit a sliding window like in a RV, or a hinged up door/window like in those contractor bed caps. If I could get around any leaking issues, it would make access to the rear cargo area great. I think I could paint the formed metal I make to cover the opening black, and most people would not notice the difference between it and the original window, except the additional opening in the sides for access.