I have a 99 Peterbilt 377 w/a JerrDan 25 ton wrecker mounted. The issue is poor braking especially loaded. Truck weighs 39600# @ just shy of 40' long, in working trim but not hooked/loaded. 39K being stopped by 2 rear axles w/16.5x7 brakes and a front axle. A ... Login to read more.