I'm one of those people who ride and drive an RV. I'm very aware of who is behind me and if I see anyone that I appear to be holding up on any two lane highway I simply pull over when appropriate and let them pass. That's also been my experience when riding the parkway for the most part and when they pull over for me I make sure I give them a big wave and a thumbs up.
However ignorance comes in all forms. Last year on the parkway I came up on a group of about 30 cruisers riding in police fashion at a breathtaking 35 mph. They appeared that they were ridding at their limit and I couldn't take the noise any longer. It sure was tempting for this ex racer to show them what a BMW could do but I opted to pull in to scenic overlook and spend ten minutes to take in the fall colors. Never saw them again.