the 720 wiki page gives a pretty good breakdown of what options came on what trim levels (https://en.wikipedia...ck#Trim_options), and you can use a vin decoder (like this - https://www.vindecod...m/EN/Nissan/720) to figure out what trim model your truck is. the thing is, these trucks come from a time when the people going to the dealer to order a new vehicle would often times pick and choose what options they wanted. stuff was a lot cheaper back then.
for example, my 81 is a DX trim model, which is the deluxe model that came standard with a bench seat and factory a/c, according to the wiki. However, my truck had factory buckets with the center console and no a/c.
my 83 is a GL trim model, which is the standard basic version that came with a bench seat and no clock or tach; however, mine has bucket seats with the center console, power steering, factory sunroof, clock, tach, and tilt steering. whoever ordered this one from the dealer did it how i probably would have, started with the basic model and ordered it with the options they wanted.
obviously wikipedia shouldn't be taken as scripture, it's put together by people like you and me after all, but it's consistent with other info i've found around in old brochures and other online resources.
Glad to see people like my work (somewhat).
Like you said, I am definitely not perfect. I guess the biggest thing is (and tdc alluded to this above) I have yet to ascertain is if the different "trim levels" were actual packages that you chose, and those were the options you got, or if you got basically a list of all the possible options, and mixed and matched. I spent a good amount of time going through brochures and online people, but because different packages were offered in different states and at different times because California, and the whole Datsun-Nissan conversion, its really difficult to know for certain. I love Wikipedia because it can be a one-stop introduction to our trucks, and I'd like to edit it more and make it as complete and comprehensive as possible. I would love to get in touch with an old Datsun/Nissan salesman and get a first hand account of some information regarding trim packages.