I am not an Isuzu evangelist, but there can be little doubt that they are sturdy vehicles. Isuzu tended to overengineer compared to other off-road brands. I have talked to several people who have experience with both Jeeps and Isuzus, and the zus are heavier built (and heavy).

Regarding the V6 oil problem, you do see a few Chevy parts here and there on my Trooper, like the coil packs for example, but AFAIK Chevy didn't had much to do with the 3.2L engines, much as we'd like to blame it on them. But nobody's perfect, look at the Toyota V6 problems...

Steve Carlson - 95 Trooper LS expo rig
Serenity now!