island911,
The cayenne (1st gen) is very capable, but on tough trails, the wrangler will destroy it. Suspension travel when off-road is not measured in the same way a street vehicle is. An inclined ramp is used.
When you lift your air suspension to full height the Cayenne does not articulate to allow the full wheel travel. For normal drivers on rough gravel roads, this is fine. But on actual trails, the Cayenne is not that great.
Four Wheeler: 2004 Four Wheeler of the Year