In Idaho there are normal OHV Laws in places and then those are supplemented sometimes by special laws regarding hunting.
And then there are laws supplemented by the landowner, i.e. Nat Forest / BLM / etc. that supersede those.
Motorized travel is very complicated - I have been at a Y in a trail, the left is clear and easily travelled by a full-size truck, the right is brushy and tight... but according to the law and maps, the left trail is illegal to travel over and the right legal.
Err heavily on the side of caution...
This is extremely accurate! LAWS what LAWS!In most areas they need to have at least a twin turbo v6 with borla exhaust to be legal to go anywhere you want. They also need custom wheels, a small lift with mud tires and a killer stereo. They should also have a hidden cooler to hold monster or miller lite. Rifle rests on the door frames and roof are also a necessity. Once you have this kind of setup you can go on closed roads, around gates, across private and blast through pretty much anything you want if you think there might be deer or elk in the area.
On a more serious note - it varies by state so check the regs wherever you're going. Usually there's a MVU map for the forests, etc. Err on the side of caution.
The Landowner laws you are referencing were what I meant by "normal OHV laws".