Surge Brakes on Tow Dolly with Exhaust Brake on MH

A long time ago I received a notice from Demco about a free modification for people with diesel rigs so they don’t drag the brakes down long grades. I never bothered with it and after 50k miles towing behind a diesel Kodiak with transmission braking there is no unexpected wear. I just had it checked and the pads did not need replacing and have never been replaced. All of our miles are in the west from SoCal north and through the Rockies.