Good morning Badmunky, and welcome aboard .
I have being a trucker for 7 years now , my truck is a Hino 338 ,96 AA with a shower , 22' box , 3.88 rears .(1900 at 60).
I will try to answer some of your points and hope others will pitch in as well .
1 - turbo fialier is normally do to 2 rezones...