Their is a strange looking truck posted in the rusty ride galleries, will have to hunt for the link but I thought maybe it was a 4 door or extended cab model, it was old also, right around those years. I had never seen anything like it before. Maybe you are referring to something completely different, like an early custom someone did???

Never heard of such a thing...but good luck with your hunt! Post a picture on here as soon as you find one, would love to see it.