So very many of the 'general population' have NEVER towed a heavy trailer and experienced the 'need for speed' to get over hills and such and the need for space to safely maneuver. I ALWAYS give loaded rigs and towing vehicles as much room to do what they need to do to SAFELY get to where they're going. It's called being considerate !
When I'm towing and a fellow motorist gives ME space I ALWAYS give them a Thank You wave or high sign.