Also remember, when turning past obstacles on the inside, the trailer will track closer to the inside of the turn than the truck by quite a bit. Do not straighten out the rig as soon as the truck gets clear of a post, curb, sign, tree, etc. Maintain the arc of the turn until the trailer wheels get past the obstacle. I see so many people want to straighten her up as soon the the truck gets clear and that only levers the trailer axles even closer to the inside of the turn. Think about the hitch ball being the pivot point and what that means.