Here in Wisconsin people have forgotten that the left lane is for passing. When I am not towing, I frequently am in the passing lane and come up behind some fool tooling along 5 mph UNDER the speed limit and they will not pull over.
When towing on the Interstate, I am frequently doing 55 to 60 mph. If I am in the right lane and a truck pulls up behind me and tries to push me down the road, I turn on my 4 way flashers. If he continues riding my donkey, I slow down. they eventually will pass. If I am in an urban area with many exit/entrance ramps, I try to stay as far right as I can but sometimes have to move to the center lane.