general problems of the 2002 Chevrolet 2500

The truck was hooked to a 25' gooseneck trailer loaded with hay. The engine was the duramax diesel with allison transmission. The intent was to haul hay from eastern washington to western washington. The power steering pump broke a shaft inside the pump making the power steering unusable. As it turns out the power steering pump also serves as the power brake assist. At a speed of about 3 lmph, it was all I could do to brake the truck but was unable to turn the wheels. It was very fortunate that this happened in the farmers field and not on the highway. If I had been driving on the highway when the pump quit working, the truck would have gone off of the roadway, most likely over a steep cliff because I would have been unable to steer the truck or stop it due to the single pump failure. Additionally, the load of hay would have caused the truck to pick up speed if it was going down hill.