I highly recommend the Muddy Buddy. My boss and I did it one year at Camp Pendleton. It was a blast and we came in 5th. There were some strong athelets there but we just seem to hit everything right that day. I think I had sand/mud in my teeth for a month afterwards.
You only use one bike per team, so just use Georges Yeti and then he has to clean it up. Also only you go through the mud so the bike really doesn't get all that dirty. My girl did the race last year and she's more prissy then any of oyu.
I already sent George the sign-up link so you 2 have to do it.
I'll be out there with a custom STR shirt.