I've been racing off-road for 20+ years now.
almost nobody uses a setup board in off-road, most just use an RPM camber gauge. You would have a difficult time even finding a setup system for off-road.
Tweaking an off-road truck might be done for a slick track.
Modified truck class typically uses 12, 11, and 10 turn motors (or brushless), matched packs are not as important because you can go down to a lower wind motor and still have plenty of runtime. Although since matched packs charge and discharge together, their overall lifespan is longer. But no, you wont need 1.22 volt cells in off-road.
the right tire and insert is 90% of car setup in off-road, you'll typically stay pretty close in chassis setup for the majority of tracks.
much more time for eating and pit racing with friends!