Very interesting. It looks a lot like what I've been looking for. I'd really have to see it in a rig before I'd drop $400 plus shipping. The good news is that it looks like from the dimensions that it'd still be able to hold my 35" tire back there if I decided to take it with me on a trail.
I really do wish there were some way I could end up seeing this (or at least a review of it installed).