[Puzzel]

If the suspension of the Holden Rodeo is tuned similarly to the Chevy Colorado, I can offer some personal opinion on the towing/hauling responses of the truck. Of course, my opinion is based on my Colorado which is only 2wd with the base level suspension.

The ride becomes more compliant and smoother with a load with a mild increase in understeer. However, there seems to be a "critical mass" at which point the ride degrades to bouncing and medium understeer. My towing experience has been limited to ~1000 lbs. Aside from slightly longer stops, which was mostly due to my caution (my motorcycle was on the trailer), I could barely notice any difference in performance (acceleration, cornering, etc).

While I enjoy the I-5, I really wish GM had bothered to certify the turbo diesel for the US.