2015 KAWASAKI Mule? 610 4x4, The 2015 Kawasaki Mule 610 4x4 is a long-lasting 4WD Side x Side that adapts to any job site. Versatility, strength and reliability come in a compact package with the Mule 610 4x4 Side x Side. While sharing all of the rugged features of the Mule 600, this Mule adds selectable four-wheel-drive, making it able to tackle more tricky terrain, and increasing its value to anyone working far off the beaten trail. And since it conveniently fits into the bed of a full-sized pickup, transporting this tough Mule to the trailhead has never been easier.