During our recent visit to your wonderful backyard, we discovered that many of the obstacles on the 9- and 10-rated trails are much easier, or in some cases only doable, with rear-steer or skid-steer. I would encourage you to consider adding a rear disconnect. There is a lot of "bang-for-the-buck" with units such as the Trail Tough product. We found ourselves using 2wd (mostly front digs, but occasionally rear) on many of the obstacles.
In addition to "skidding" to a new line, the video you showed of Mace breaking a rear axle (I presume), shows another advantage. He broke because the passenger rear was way undercut and bound. "Pushing" with RWD leads to failure, but sometimes "pulling" with FWD-only can often allow the tire to lift out of the bind In that case a front dig to the driver's side may have saved him........or maybe not