As to why it's only on the right side of the rig, I might hazard a guess. We did the same thing with large QR code decals on our apparatus, and our reasoning was that we wanted the message (1) Large enough to read from the sidewalk when the rig was in the street, and (2) Only on the curb side to keep pedestrians safer while reading it. We figured that most of the road-side traffic was moving and should be watching the road rather than trying to "read" our rigs . . . So it was all about safety.
Great looking rig, by the way.
Great looking rig, by the way.