Has anyone ever heard of a diesel powered 66 caveman camper?

[drumyn61]

I'm looking at a potential race car tow rig and this is what he said:

Apparently from what I recall the Grandfather worked at the GM factory and had it custom built or built it himself while at work. Its also got I think he said a "Browning" dual stage transmission,. I could have that wrong,. supposed to be rare and a really cool feature that's supposedly worth a couple grand all on its own. Several people have tried to buy the engine/trans out of it just for that.

Being a inline six diesel its got the torque and fuel economy for a good tow vehicle, I haven't taken it out on the highway to see what it drives like at full speed but the short drive around the block that I took it for it drove great.