I don't think they are deeper as you're limited to the depth of the bumper beam. If you're that concerned about cooling capacity, I'm sure someone local could make you a two core aluminum...with 1" rows and 34" core you'd never overheat.

But I drive in the hot ass Texas summers with that 34" rad, LS1 fans, and a 160* thermo...no cooling problems at all.

You don't need a monster oil cooler, do you road race or auto-x the car? No, so a slight cooling of the oil is fine. Have you or will you see oil temps over 250*?

Spend the money elsewhere please, your concern in cooling isn't needed with these trucks. I can keep my temps in the upper 170s to lower 180s easily with the setup I have.