I hit a rock coming down a grade while turning to avoid another rock, and dented my front right bumper. If I had a spotter that wouldn't have happened. Other than that I had no problems with clearance on that trail.
It's only $400 to replace the bumper, but haven't gotten around to it yet, since I'm still going out frequently. I'll be getting it fixed in a month or so, it's beginning to become an eyesore. I'm also thinking of putting a ShrockWorks bumper on instead though.