Wanted to add something to my post above but not use the "edit." The following is only my opinion and should be taken as such

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I would consider owning a CUCV but only as a "user" truck and not as a restoration project. Maybe its all those bad experiences I had with civilian Chevys from that time period, I don't know.
For me, the CUCV fits into a similar catagory as all of those old 70s/80s 4X4s that are almost worn out but you buy them anyway to use for trail riding and what not. When they finally die, it's off to the slavage yard with them.
I'm not saying that all those CUCVs are crap, far from it but they lack the styling features and charm of the strictly tactical vehicles. They are also more difficult to work on when compared to said vehicles.
If you really want one, buy it for the right reasons but, do your research first. As previously mentioned, steelsoldiers is a good source for info and seems (to me) to be the site dedicated to (late) M series MVs and the people who love them. Another site that may be of help is
www.g503.com that is a pretty large site as well with many forums.
Good Luck!!
Matt