For those anywhere near Sayre Oklahoma there is Buzzard Canyon. It has some open wheel dates and will also open up for group rides by contacting the operator. There are trails out there of levels of difficulty from very easy, aka stock, to rock crawler. I have called the operator a number of times for Military Jeepers and for others to setup runs. There is an area for camping and unloading for those that want to haul them out there on a trailer.