What is the most stressful part of driving your coach?

The only time I was stressed was when I crossed a narrow bridge over the columbia river and a semi coming at me started pointing at me to move over and I was already next to the rail. Needless to say he won and I slightly glazed the guard rail and scratched the Motorhome. I was really pissed and needless to say there are a lot of rude and thoughtless semi drivers out there!!