This is what I found out...can't guarantee its 100% accurate though:
1) The door is made by AMP Research (
www.amp-research.com). They make the aluminum billet fuel doors for all the major companies...(Ford, Mitsubishi, Dodge, Chevy, Mazda, etc). I guess they also make the retractable running board for the H2 that was shown at SEMA.
2) Its a patented design...
3) It supposedly has a hidden lock thru one of the bolts.
4) It comes with a whole new plastic cup, so all you have to do is unbolt the old one with the 3 bolts.
5) No idea who is supplying it or how much it costs
I saw this at a buddies office and scanned the picture...
Here is the one of the Retractable running Board that is really cool...