The 1962 Chevy 4x4 Brochure, Front page shows a truck with no hubcaps. Inside the brochure there are hub caps shown. The interesting part is that it looks like the caps have a large hole in them. You can see the lugs in front and rear? I don't know if I see what I think I see but I think I do, you see? Never seen a 1962 GMC 4x4 brochure.
Here is something cool for the archives:
http://online.wr.usgs.gov/outreach/h.../suburban.html