I travel back roads often ... Take it slow and listen to what your rig is telling you. It will make noises so learn the sounds telling you to slow down. Some washboards and pot holed sections are best with a very slow crawl (relax let others go by and don't hurry). With some experience you'll know right where each wheel is to help pick the smoothest lines possible.
For those pesky dips and rough spots, a few packs of lynx levelers can get you through without carnage. If you have a slide and don't normally use the brace bar(s) ... dirt roads are a good time to use them!
Axis 24.2 "was" tug'n a JK