If you've already picked out some potential areas on a map or photo, then just stop by the Ranger Station and simply ask them: Is it OK if I boondock here? If not, where do you suggest and how should I proceed? The answers you get from a LEO or a USFS Ranger will hold a lot more water than any suggestion you get from this forum - especially if you get challenged by a LEO! :)
Having said that, a lot of it boils down to what resource damage you may cause. If you are mowing down young trees or seedlings/saplings that have just been planted, then you may well get a citation.
Best I can say is that you use common sense. Look at and walk the area before you drive into it. Not sure just how you drive, but you shouldn't be "tearing up the dirt" if you proceed carefully and slowly. Remember that on many national forests, the area may have been harvested by heavy equipment (skidders, dozers, etc.) and yet several years later people think it is pristine wilderness.
