That is a purpose built quail hunting rig. Two hunters on the front, and two up top. Slow rolling through a grassy field, that is the perfect setup, and appears to be done very nice. Used to hunt off those type rigs many many times years ago. A couple of dogs did all the retrieving, and you never had get off until the hunt was over. Throw a dozen or so KC lights on it, and hunt rabbits at night. All shotgun hunts, rotating turns firing. I’ve got a super 8 film around here somewhere from when I mounted the camera in between the seats up front. Watching it looks like I’m slowly levitating above the ground through a field and shooting every once in a while, while having conversations with the invisible man next to me.
Now days, you could add rifle rests and hunt deer, or hogs, or whatever from it in a parked position, like a portable blind. I gotta tell you though, cruising down the road while sitting on the outside of that, and going around a curve is an experience you don’t forget. Four hunters, a driver, plus a couple of dogs, plus the added weight of all the additional hardware makes for a severely unstable ride.