Every now and then while looking for something else, we stumble across a truck that catches our eye and we just have to share it. Such is the case of this 1975 GMC 9500 that was posted to the 60s & 70s American Cars Facebook page. We recognize the truck, but wonder what it’s attached to. It looks like some sort of bus or a trailer designed for hauling people instead of livestock. Ever see this? What do you think of it? Know what it is?