I have a 1976 C20 which had 16.5" wheels. They have hubcaps, and I believe both are stock. They look like this:
http://www.disco-zombie.net/tmp/breakdown_hubcaps.pngAfter one of my tires ripped itself apart, I replaced them with some 16" wheels/tires I got off craigslist so I don't have to deal with finding 16.5" tires from here on. So now I have four of those hubcaps, four of those 16.5" wheels, and three 16.5" tires. Not sure if anybody would care about the wheels, as I think there might be easier-to-deal-with 16" wheels from a later model that these hubcaps fit, but people interested in restoration (or just having stock/vintage parts) might still want the hubcaps.
On the other hand, looking at ebay...
http://www.ebay.com/bhp/chevy-3-4-ton-hub-caps...they don't seem terribly hard to find.
I'm lazy, and don't care about making the $20-$60 off them that ebay might suggest, but don't want to get bad "truck karma" either.

So given that I'd prefer to just go to a tire shop and get everything off my hands (with recycling/dumping them being my next step), should I be trying to ensure these items (or at least the hubcaps) "stay in circulation"? Or are they a dime a dozen and it doesn't really matter what I do with them?
I have a horrible pack rat nature that I've been fighting lately. My traditional "solution" to this problem would be to keep them indefinitely "just in case"...