I have no information other than what you referenced from the same article in Airstream Life Magazine.
That said, I have been to Japan alot, and have witnessed some strange mods to American import items.
I find the bike rack a curious addition. The Japanese take their vehicle laws very serious. Smog control inspections are some of the strictest in the world. Care and upkeep of all vehicles is required, vehicle damage has to be repaired, tires are inspected regularly, etc.... I believe that if they allowed this modification then they studied it carefully and it is approved.
Now, we just need to see how they did it.
I will be in Tokyo in the spring, I think a trip to the one and only dealership is a sutiable way to spend my rest day. Who knows what I will find for decorations in my camper.
Michael & Tina with Layla and Preston BZ
The family has grown.
2003 22' INTERNATIONAL CCD