They’re built for it. It has a true transfer case w/ low-range (and a very deep 1st gear in the auto trans, so overall a very good crawl ratio), a locking center diff standard, and mine has the optional locking rear diff. The front diff is actually open AFAIK but the computer will use the brakes to slow the spinning wheel up front in lieu of a locker (not ideal but still pretty damn good when the center and rear are fully locked). It also has an extra high setting for the air susp for wheeling. Beyond that it will raise up a little bit further than what you can select yourself if it senses it’s high-centered, sort of a “safety net”. The susp also auto-levels to allow you to take a much steeper side-hill. It also has this whole terrain control thing going on with settings for mud, snow, sand, and even one for rock crawling in addition to the usual on road setting. That system changes settings for the traction control, diffs, power deliver etc. Oh, and lastly there’s hill decent control as well.
Here’s a few clips of RRS’s doing there thing offorad:
-TJ