I must be doing something wrong. Today unhitching on a slight downgrade, we got Jolli Olli level, set chocks and raised the tongue. The truck and trailer appeared to be lined up. When the bulldog came off the ball, the trailer lerched sideways close to 1-1/2' and back a foot, with the front jack block sliding and the front jack almost coming off the block. This is the worst I have ever seen. We have this happen on a regular basis (not bad like today, but almost every time we unhitch) and don't know how to stop the tension and lerching. I have to believe the bulldog should be able to lift off the ball smoothly. Thanks for any advice.