The 4-Wheel Jamboree is also home to the National Mud Racing Organization (NMRO). The NMRO is the sanctioning body for straight-line mud drag racing and 4x4 stock and modified Tough Truck racing. Competitors compete for a purse and a season series points championship. This is a membership organization made up of over 400 racers.

NMRO Rules
NMRO Rules - 2011 Addendum