If you wheel it, it will break.
~SoCo
I don't quite agree with that, the driver breaks the vehicle. I've seen more people break their rigs from just being stupid more than it actually "finding the limits" of the components. Too much skinny pedal, poor spotters watching poor drivers, sharp turns and lots of wheel spin.
The worst of my adventures included a popped bead, torn off door surround and a broken tail light. Certainly there are some obstacles I have left on the table, but that's what gets me home and to work the next morning. Knowing what the rig can do safely and how you can get it there is key for keeping your rig being able to go home. Most would say that since I haven't broken anything, I haven't wheeled hard enough. Which can be the case, but for many around here...if you aren't breaking shit, you aren't trying to hard enough....which isn't how I do business.
I've definitely bit off more than I could chew, but good spotting and not being afraid/too proud to pull cable keeps the rig in one piece. I don't claim to be a very good driver or the best spotter, but what I manage to do works for me.