The infamous Wyotech/Extreme 4X4 rig has the Inchworm auto setup but it doesn't seem to make it out to compete.
This is what I would probably do if I were to built one of these, but I'm probably in the minority with this.
In all of the comps, I was impressed with the rigs that ran propane. There is a lot to be said about driving with rig flopped on it's side across the finish gate within the time limit. 
A carbed rig will stall. And now that there isn't a penalty for running EFI or propane, carbed rigs have a disadvantage.
This coupled with a really good synthetic oil, like redline, would probably work really well. I don't think a $50 oil change would be that big of a deal in a competition rig either, especially considering you would barely ever need to change it due to low use, and it will not break down while sitting around like a conventional either.
