The spotter needs to remember to look up! It’s easy to become so preoccupied with obstacles on the ground that you forget to check overhead for tree limbs and wires. Always watch for leaning trees you may miss the base of the trunk just fine, but if that tree is leaning toward your trailer, it will take a bite out of your rig high up on the roofline!
If you need to turn the trailer around a corner, steer the trailer toward the corner. Then you must steer slightly in the opposite direction to maintain the turning angle. Get out and make sure that you are in the proper position before continuing.
It is important not to get the truck and trailer jackknifed, so do not let the turn go too far. Ideally, you can back into the space in one smooth motion. You almost always will have to stop, pull forward to achieve a more straight reverse.