As others have said, I too run Rotella T6. I bought some at NAPA on sale for $23 or so this weekend. I do have to ask what you consider High ZDDP? I think the T6 and other diesel oils have about 1000 ppm of Zinc. Some of the Hot Roaders or Older Muscle car owners use Brad Penns with 1600 ppm Zinc.
I have also used Rotella T4, both 15W-45 and 10W-30. I see the list posted, but at #12 to #16 T6 will do its job. Also, different engines do different things to different oils.
I also trust and try to use synthetic oils. Still, the new conventional oils are no slouch either. Also, the cats on the 4.0l are older type. So, the Zinc won't plug them like newer cats. Now if I had a 2000 Cali or 2001, with the pre-cats, then I might have to think about it. I actually do have a 2001, but its a shell and I'll have to see who I configure it.
So, Rotella, Delvac and other Deisel Oils should fill the bill. AMsoil would be a good choice along with Shaffer, if you want to spend a bit more.