From my own experience in deep sand on back country roads, the stock TW tires will get you thru, but not gracefully.
The bike is, as the name implies, a trail bike. Take it easy, smell the pine, or sage, look at the scenery and not worry about the terrain.
The nickname of Mule is apt. Load it up & go somewhere, or anywhere. I have had it out on farm trails that have in one trip a variety of surfaces...
from packed dirt to grass covered, then needles & leaves, then gravel & stones, clay...
It's not gonna be the best on any of them, but it will be good on all of them.
Well, at least that's my 2¢.