from the article talking about the WK2's ability to find traction--
Without question, the Quadra-Drive II system on the Grand Cherokee is the most impressive fully-automatic traction control on the market. Toyota doesn’t come close and it even bests our previous test-track benchmark, the Land Rover LR4. We even took the LR4 and GC Overland out to the track at the same time to confirm our assessment, and the video proves it, time and again. Once the Grand Cherokee is in low range, the system becomes quite aggressive and nearly favors center and rear differential lock over open. Even a 16th of variation in rotation between two wheels on the rear axle results in the differential locking. There was no delay, there was no harsh engagement, there was no wheelspin unless all four where spinning.
We subjected the Grand Cherokee to every traction challenge available on our extended test track, which includes extreme cross-axle obstacles, boulders, loose climbs, ledges, sand, decomposing granite and Sedona sandstone. The traction control system never faltered. That is not to say we didn’t find the limits of the vehicle, but never the limits of the traction control. The Grand Cherokee Quadra Drive II is the first automatic system to receive 4 out of 5 for traction performance.
Full review here along with a video at the bottom.