We encounter it every year. Some RVers are unsure of their ability to pilot their rigs. Especially the rental crowd. We drive the Icefields Parkway four or five times a year. Lots of rentals there. I think a lot of them are intimidated by the size and seem to think that driving slowly is safer. Lots of time they are driving 40 to 45 MPH and never pull over to let anyone by. I blame the rental companies for improper instruction when the unit is picked up.
Every year at least once there are lots of vehicles stopped to see wildlife on the side of the road. Inevitably an rv won't pull over to the side of the road. Last summer not only did they stop in the middle of the road but they all got out with cameras to take pictures. I knew that if I honked my horn I would be flipped off so we waited almost 10 minutes, I counted 21 others behind him. So inconsiderate.
Most of us have a couple of horror stories about this type of driver. Too bad we can't do anything about it.