I've checked out the underside of the trunk (installed new shocks recently) and am looking into a receiver that will fit to the frame. Is the cooler you refer to similar to a radiator style that mounts in tandem with the engine's radiator? Anyone have recommendations on a particular unit?

I'm excited to get the old Benz back on the road. It will replace the tired and leaky '90 Suburban. The 6.2 still runs like a champ but it's got terminal cancer. We've battled it for years and I'm finally going the do not resuscitate route. I'm tired of the "driving a B-29 bomber" experience.