Mirrors.. no one said we needed Mirrors

This is a pet peeve that seems to be getting worse. While we headed home on Friday the weekend warriors were heading out to their various destinations. I passed by 65 travel trailers being pulled by SUV's, PU's and cars. Only one... Had proper towing mirrors. None of them could see passed the front of their trailers. It made it quite dangerous when they tried to change lanes. Then there were others that dealt with the poor visibility by putting the peddle to the metal and passed everything in sight not bothering with what was behind them. Most of them were commendable for having the proper sway bars etc. But missed the boat on extended mirrors. Is this something that no one told the newbies?