In fact, as you go down Kane Creek, just past the private campground on the right, is a small 4x4 trail that does up the mesa on the left (access to a hiking trail I believe). That is where the vehicles went over the mesa cliff at the end. And, take note that that the cliff scenes were actually filmed on "private" land. Therefore, the rock destruction that happened during the filming.
In addition, the Lincoln was actually lowered by a bulldozer, and the Yaris did not actually dislodge the Lincoln at the end. The bulldozer did it and it was made to look like the Yaris did the dislodging.
They had traffic stopped for over 2 hours to do the filming.
