Free: Contests & Raffles.
Those units are mostly privately owned timber company lands so there will be lots of gates that will be locked and there are also large areas that required an access permit depending on who owns the land. Some companies lock gates but still allow access (hike/bike). I wouldn't call any of those areas a backcountry experience just because there are so many roads/activity going on, but I'm sure you could get away somewhere. There are also large chunks of state land that allows driving with no access permit required. The main thing I would tell you is to know whose land you're on so you know whether or not you need a permit. Hope this helps