Here are some coordinates:
http://www.4x4now.com/33jshr.htm
This site also says Hell's Revenge rates a 4+:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content"> 4 + We can hardly improve on the original description written a few years ago by Jack Bickers: "with driving by World Class Yahoo Jeepers not much concerned with vehicle durability or personal safety." It is common to have as many as 10 percent of the vehicles experience major mechanical failures (gears, axles, driveshafts) on these trails. </div></BLOCKQUOTE>