Hmmm just throwing ideas
You want stages not just one "go all the way to the top"

everyone likes to watch but we all prefer to play!
each stage has to be long enough that its not just a team recovery event
set a safe time limit per stage and points off for slower or slipping outside, points on for creative/impressive shit

hey it promotes the fun side
Or we could say base pionts for driving and nock pionts off for each use of recovery eg single snatch -10, double snatch -15, winch -25

this would promote some really balls out attempts
prizes for most damage, most spectacular etc oh and all prizes to be consumed before leaving prize giving
Has to be safe enough that if you roll/crash you don't need to have a cage!!
Hmmm, getting past my bed time so I'll leave it at that
Cheers Reece