Headlights are too high towing, getting high beam flashed.

I installed Firestone air bags for just that reason. They also helped improve the ride quality when towing. It’s a lot easier to add 10 psi of air to the airbags than it is to re-aim your headlights each time you tow. If oncoming vehicles flash their lights then it probably means they are being blinded by them. Thanks for not just flashing your lights at them as the previous suggestions were stupid.