In my first 3 seasons I went through 3 spindles. Catching rocks under low snow, steep downhill descents with the ski going under a tree... stuff like that. I thought I broke my wrist I hit one root so hard my first year.. still no bent forks. Because of this I do not run the rear cross member to reinforce the spindle. Everyone tells me I'm stupid for doing that but I'd rather smoke 20 spindles than go through 1 set of forks.
Other than spindles I've gone through a couple chaincase covers, snapped the sub frame at the bike connect cross members along with the strut rod (covered under warranty), and I've had a turbo bike I was tuning flip over the cab of my GMC and land on the street... sorry Roger! Not much you can do when you are run off the road by a jackass in a Toyota Yaris.