This is the rating system used by The JonFund, Inc.
|1-2||1-2||OEM 4WD w/ low range Very mild trail with the possibility of small rocks or mild mud/water crossings. 4wd may not be needed for entire trail.|
|3-4||3-4||30" aggressive (MT or AT) tires and disconnected sway-bars. Mild trail with moderately demanding mud and/or rock work. Obstacles will require the use 4wd.|
|5-6||5-6||31" aggressive tires plus 1 traction aiding device (Limited Slip or Locking) OR a winch Mildly demanding trail with the possibility of deep mud/water crossings. Rocks will be larger so the use of undercarriage protection is recommended|
|7-8||7-8||33" tires 1 locking device OR a winch. Demanding trail with the likelihood of getting stuck. Moderately large rock/bolder work should be expected.|
|9||9||33" tires 2 lockers OR 1 locker and a winch Extreme trail with large rock/bolder work. Expect you vehicle to be at extreme angles. Likelihood of getting stuck is high. Body damage should be expected.|
|10||10||35+" tires 2 lockers and a winch Most extreme trails reserved for drivers who feel they are highly experienced. Body damage should be expected and welcomed! Very high likelihood of breaking/getting stuck. Roll over protection is strongly recommended.|
Note: Trail ratings are highly subjective. A trail that is easy for an experienced driver with a highly modified vehicle may be impassable for a novice driver in a stock vehicle. Weather conditions may also significantly affect the difficulty of a trail. Also, the difficulty of a trail may change over time, as trail use, weather, and maintenance modify the trail. Always check with the managing organization and/or recent users before planning a trip on a trail and scout ahead on foot if you are not sure of current conditions.