Mount L bracket to the desired location on the camper. Be aware that it should be mounted in a location as to avoid coming in contact with the bed of the truck. Mount leaving the larger hole facing down to allow for the cable to be fed through it later.
Next, run the loose end of the cable from the outside of the L bracket through the eyelet welded to the top plate of the hitch and then down through the hole in the release handle. At this point, the black cable handle should be flush with the outside of the L bracket as to be accessed by standing outside of the truck bed.
Pull all the excess slack through the handle of the release lever making sure the black handle of the cable is seated against the L bracket. Once the cable is snug make a tight loop back to itself and attach using the C-clamp to secure it.
To check to see if the cable is it the right length pull the handle until the stop on the cable comes through the L bracket and is seated in the open position. Then trim the excess cable.
http://canalsideconferencecentre.co.uk/links.php IMPORTANT – BEFORE TOWING MAKE SURE THE CABLE HAS BEEN RELEASED ALLOWING THE LOCK TO BE ENGAGED.