Well, thanks for your replies. That makes sense now. I assumed that the 5-window, being an option that obviously cost more money, would be the "rarer" version. But, the old-timer who told me that the "standard" cab was rarer probably meant just that. Probably, most of those old standard cab trucks were worked to death (particularly here in the Deep South). He may have meant that more of 5-windows have survived. Just guessing, but he is older than dirt, and has restored quite a few of these old trucks and still stays busy rebuilding engines for a living.
