New brushless e-revo owner

I recently made the plunge and picked up a brushless e-revo. my first run was disastrous. less than 2 minutes in I hooked one of the rear wheels on a sign post and broke a lower suspension arm, the bulkhead it was attached to, the rear skid plate and bent the aluminum plate that holds the back together. a quick trip to the hobby shop and 3 hours of maintenance later and i'm good to go.

Second run I took it out someplace with a little more space. I had a blast with it. but after the run i noticed one of my front wheels is wobbling, i think i ran into a tree at some point. at first glance nothing looks broken. what should i look for that might be causing this?