Good advice here. I've only been driving my antique 30-footer for a couple of months. I always subscribe to these types of threads!
One thing I've learned to do is to plot my routes carefully. Google maps and/or GPS don't always provide an RV friendly route. On a recent trip, google maps wanted to take me on a route that had a bridge with a 4-ton weight limit and 11-foot vertical clearance. Luckily I spotted it in an aerial view of the route and went a different way.
I'm also super-paranoid about where I get off the highway, the businesses I pull into, etc. to make sure I can get turned around or out of a lot.