Yamaha Viking SBS Rear Seat and Roll Cage This Viking came with a dump bed. We needed grandkid space so added the rumble seat and built a custom roll cage to surround them. Side view – 3 seater rumble seat, 4 point harnesses. To use the dump bed, unclamp the front mounts, remove 2 tie bars on the rear and the seat and cage comes out easily. Seat not shown here.