I happened across this interactive map, that shows a LOT of the backcountry trails, and fairly updated status, at least as far as Gov't road closures and limitations are concerned. Several different views, including satellite imagery, with road/trail overlays, including campgrounds, and who sponsors and maintains them. You can drill down with the satellite view to get some pretty amazing overhead views of some of the areas, though a ground level view is a lot more helpful to see grades, slopes, yadayadayada....some fairly important considerations when 'wheeling.
IIRC, you can also overlay the IDFG (Idaho Dep of Fish and Game) hunt unit boundaries and designations.
Thought some may be interested.
As always, Take 'er Easy!