The 1999 Chili Challenge sported 19 trails, four of which were tagged with the rating of extreme. When the SWFWDA says extreme, or even hard, they mean it. For those without lockers, there are plenty of moderate and easy trails that will still challenge driver and vehicle. If your vehicle has at least 33s and one locker, the hard trails are fair game. Only those with 33 or larger tires and two lockers are allowed on extreme trails.