I did a double metric with 10000' last year, so I know I'm capable. Actually, the biggest issue with that one for me was back pain from being on the bike so long. The hills I just did low-and-go-slow.

But, like I said, I need a good butt kicking to get my brain back in the right place. I think this would do it for me. If I could survive the Tour de Fire, I could probably survive the Desperado Dual (seriously considering...just considering...).