My only gripe about surge brakes is the inability to apply ONLY the trailer brakes. If the trailer gets into a sway, locking down on the trailer brakes and using full throttle on the tow vehicle is one way (usually the only way) to stop the sway. I saw my father get a travel trailer under control after two almost 90-degree fishtails like that, after a speeding Peterbilt had blown the trailer off the road with its bow wave. I was watching that scene in my rear view, after the truck passed me at what looked like 100 MPH+. The jerk was out of sight before I could get a plate number.
Jerry
