I have an original Carter Carpac rack, one of the rarer long ones that fit well on a Suburban or panel. Not too hard to find the shorter wagon ones, but the long ones are rare.
www.classicracks.com repo's these racks, but they are pricey. If you look at the 2011 Stovebolt Panels and Suburbans calendar my Suburban is in there with the rack on.
