You'll do great, it will just be the climbing type powder riding that a 136" starts to get stuck. Just hang out behind another rider in the group that is breaking trail and bounce in and out of his track, if you start to get stuck, dart back into his track.
Used to do this years ago, two or three guys would play leap frog..... the guy behind the leader (leader would be breaking trail) would get as much momentum as he could from riding in the the leader's track and then shoot around the leader and try to go as far as he could in the powder, meanwhile the original leader then darts back over into the new track, gains his momentum back, and starts the process over again.
Can anyone say.......the Phazer days!!!