I am very appreciative of the input that so many have given on this matter.
I do have a couple of extra questions now based on what others have said.
1. Can I get an upgraded intercooler without getting a new turbo?
2. Is this a half step?
3. I understand (now) that added induction without turbo changes is maybe not worth the effort.
4. That I don't need any of this, really.
5. If I was to bite the bullet and try to get reliable, increased performance as a tow vehicle (I am not a rock crawler, I am a tourer) what is the optimal setup?

I like my 3.0 GU3 Di Patrol. It has been an excellent servant.