[ChrisA]

Thought about something on the way home tonight. Every now-and-then on the highway, I'll hit the brakes and get a simular shake and a little brake pedal pulsing. Never notice it at slower speeds. Perhaps I have a bad brake drum and when the truck is loaded during towing the rear brake adjustment is causing a little bit of drag on that drum and making the truck sort-of wag it's tail. I don't know that the rear brakes have ever been serviced on this truck. I have planned to check them and have a set of shoes in storage, just haven't had the time yet to mess with them.