The keyword (primarily for federal land) is MVUM. It stands for Motor Vehicle Use Map. It will be an awkward PDF. Green dotted will indicate trails you can drive on. If you can't pull off all trails to camp little dots will indicate where that's allowed.
BLM and USFS websites have horrible navigation. Just Google the name of the forest with "MVUM". You might also need to first Google forest name + district map and then Google MVUMs for the specific district.
Another option is the MVUM layer in CalTopo (the name comes from the fact it started as just CA, but it's national nowadays)
BLM and USFS websites have horrible navigation. Just Google the name of the forest with "MVUM". You might also need to first Google forest name + district map and then Google MVUMs for the specific district.
Another option is the MVUM layer in CalTopo (the name comes from the fact it started as just CA, but it's national nowadays)