can't find a link to the video with it in, but I was thinking like really big barrels, cable reel size (assuming the one you talked about was smaller?)
I'd love to one day organize a comp with traditional trialsy stuff (rocks, logs, cocncrete etc) then have other things mixed in like a speed trial section, ramps, an uphill section (the further you get up, the fewer points you get like at moto comps), swings, seesaws and stuff like that. Maybe the last section would have you ride through oil soaked mud to make every one brakeless and see how they get on.
I'm far far too lazy to ever do that though.