The thing is definatley cool. I've been feverishly searching (indeed using google) and I found a forum, full of active users.
http://www.vehicross.info
I should probably get some good info there. Yeah, they are older (I guess they never took off...) But if you get think about it, parts shouldn't be too hard to come by, because it is an Isuzu after all. I drive a '96 Acura SLX (an Isuzu Trooper in a tuxedo, basically), and it has not only been very reliant, but repairs aren't awful at all, plus parts are still easy to come by.
I'm anxious to read on their forums how they do off road. It's definately a unique truck, that's for sure.