When backing a 5th wheel, put your hand on the BOTTOM of the steering wheel and turn it in the direction you want the BACK END of the trailer to go. It takes a while to start turning, but once it does it turns fast, so you need to start straightening your tow vehicle out before you're done turning.
I have my cell phone attached to the truck's stereo via Bluetooth. DW stands behind the rig and tells me by phone which direction the back end needs to go. The only other thing she will tell me is when to stop to avoid hitting something. It takes practice, but it works well.
