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So, all I need now are some rigs and a test track...
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maybe Can Am RV? they are the only ones I have seen that do actual rig testing outside of some grad student ME efforts.
You need 2 accelerometers, one on the trailer side and one on the TV side of the ball. That would help infer the net force at the ball.
Then you could run some experiments for both road shocks and for sway. I don't know whether the 1 second time resolution would be sufficient for some of the vibration that loosens rivets, though.
It would probably also be good to put accelerometers where the A frame meets the body and at the rear of the trailer so you could, with an appropriate analysis, determine how a shock propagates down the frame and determine resonance issues.