The Ultra4 American Rocksports Challenge will invade the most cutting edge motorsports park in the United States September 21st – 23rd. This 511 acre campus is home to world class motorsports events and will now play host to a new breed in Ultra4 racing. The 7 acre rock crawling facility built in 2009 will be modified for intense racing action. Teams will traverse the man made terrain in the fastest time possible. The races will combine the total area of the courses for a no holds barred assault by the teams to see who can conquer the American Rocksports Challenge and take home the first ARC Trophy. This event will be a timed event. The Miller Motorsports Off-road facility is laid out to allow great spectator access.