I've noticed an erosion of skill,, courtesy and care of many drivers on the road.
During my jaunts towing 27 and 24' rec and cargo trailers I learned a skill/method to deal with most passers. Without crowing the lane line allow your combe to drift to the left before prospective passer gets close, as he's gaining speed and getting along the tow vehicle slowly drift to the right, passer has already chosen his line and it really makes a difference as to how much additionsl space you gain with only a foot or two of lateral movement.