Cat has success with the big truck market, it has captured 50% of all truck sales I would guess, the other 50% is Detroit, and Cummins. The big success came with the 425 -3406 model, these engines were long lived at 500,000+ miles, they had the potential of mega bombing (several out there in the 600-800 hp area), and they would PULLLL. This engine in the rigs is kin to the Cummins in the pickup market. I would be tempted by Cat, if they had a proven engine in the size of 5. 9 - 7. 0 liter, and it was a inline six. If they could put retarder technology on it----SOLD. But, in all reality, I really do not care for all that electronics, and my old twelve valve has more life than I have left.

But it is fun to dream.
Cat did put a 3208 in a few Ford one tons for awhile in the late 70s. A friend of mine bought a used one. It was a hog, it would run like a scalded ape, but only got around 10MPG. At 110,000 miles it ate a valve and sent it through a turbo (twin turbos), he went to get it fixed and was quoted a repair price of over $4000. 00 . The truck was parked.