This was what I was going to post. Ultimately, copper brass does out cool aluminum, but it's not cheap. At all. The Optima radiator is what I have planned for Gladys, my ford truck, bot of course I cannot get it done anytime soon. That's actually very similar to what Ford had her originally equipped with, being an F250HD and having the Camper Special package. I have an aluminum 2 row in her now, with 2 rows of 1.25" tubes and while she does not over heat, the temp starts creeping up in traffic with the A/C on. She cools back down some on the road, but there's room for improvement and I know the radiator is where it is.
