That Isuzu one is brilliant unless you want anything engine wise. It only caters for the US models.
When you read 2.8 and 3.1 it refers to the 2.8 and 3.1 petrol engines

Isuzu produced a selection of engines for the trooper including the following:
Petrol:
2.3
2.6
2.8
3.1
3.2
Diesel:
2.8
3.0
3.1
Just to make people aware.