What is the most stressful part of driving your coach?

I guess my most stressful is when the big rigs (tractor/trailer) cargo trucks enter my air space. I literally have to hang onto the steering wheel to keep from being pushed into the shoulder of the freeway. I have pumped up my air bags in hopes that that might help. Waiting for the next trip to tell. I was going to install a steering stabilizer, but all the experts say that will only help with bumps and irregular road surface.