Hi
I don't have any answers except to say I bought the first one in my area in 2004. I specced the LS1 and as I'm in a wheel chair I had an auto fitted
Because I'm a bit different I got a guy to add another (trailing) axle.
It looked quite good I'm told but after about a year I took the axle out as without spending a lot of money fitting airbags or some sort of axle lift mechanism I tore it out (I got sick of sitting there spinning my wheels going nowhere)
But apart from adding cold air box, headers and a few other bits it went great, I caned the hell out of it, did burnouts all the time raced a guy in a Falcon Race Ute (and beat em).
I did I think 70000 then bought an 06 Maloo
So I'm not any help here mate but TBH they didn't seem to be the most popular vehicle around for some reason.
But absolutely nothing failed at all and we had a few big loads on it regularly and had a lot of fun in it