Recommend cold crank amps?

Most of you are too young. But I remember the "diesel days" of GM. I'm talking about the ill fated 350 diesel, which unGenerous Motors stuck in all kinds of rigs. These things came with a pair of just about the best batteries Delco had, unlike a lot of new cars, back then, which came with a mediocre battery.

Anyhow, a guy came into the store where I worked, and was "interested" in a battery, only he wanted a cheap 48 month, "just one." There was only one battery in the car.

I could not seem to get across to him, that he needed a better battery, so I TOLD him that. "GM put the best batteries they made in this thing, and TWO of em."

I think he finally bought a better battery, but it was still only one, LMAO