Canadian Dispatch Riders
 

Short Video
https://www.youtube.com/watch?v=ZTerqATYvy4

And this is a British one for somebody who has only ridden a horse and never seen a mechanical object. Pretty thorough coverage.
https://www.youtube.com/watch?v=pRXP5zr8dmg

Meanwhile the Americans in their two wheel heavy transports are really getting in to it.
https://www.youtube.com/watch?v=qSbdc39VlPY