off-roader

noun

a motor vehicle designed for use away from public roads, esp on rough terrain
an owner or driver of an off-road vehicle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012