Xtream Rock Island Grand Prix welcomes The Hemp Doctor as Presenting Sponsor Xtream Rock Island Grand Prix welcomes The Hemp Doctor as Presenting Sponsor Bas Kaligis / Thursday, March 28, 2024 0 713 Article rating: No rating The Xtream Rock Island Grand Prix, the world’s largest and most prestigious karting street race, is excited to announce a new national level partnership with The Hemp Doctor, based in Mooresville, N.C., as Presenting Sponsor of the race. The Hemp Doctor is a major national manufacturer and distributor of legal hemp/CBD products and Rock Island is The Doctor’s first house call into motorsports. Read more