[jking]

I spent 6years as a driver trainer for a major long-haul trucking company. What everybody says is true, PRACTICE! Also it is 90% set-up. The Z theory is correct, S turns! Learn to observe the track your trailer tires follow. Communicate with your spotter ALWAYS CALMLY! Get out and look BEFORE it’s too late, and do as many pull-ups as you need. Always aim for a Drivers side back-in if possible. And NEVER spend more than ONE - two seconds in any Mirror, as soon as you do it changes in the other mirror. Practice, practice, practice and stay calm! (Walk away, smoke a cigarette, what ever it takes!). Good luck.
This advice is worth what you paid for it. ��