Buy the NKOK Mean Machines: R/C Rock Crawler Prowler at Michaels.com. Get your climb on with the Mean Machines R/C 1:14 scale 4x4 Stinger or Prowler Rock Crawler. These full function radio controlled rock crawler trucks exhibit a superior level of performance thanks to the real-time 4x4 and the innovative Hi-Flex suspension system that give them unparalleled rock crawling abilities.