We have been searching for some time for a reliable system to bridge the gap between a trailer or caravan when mounting a reversing camera on it. Our wireless bridge is one way this can be done. A cheaper alternative is to use a split cable system. The photograph below shows how this can be achieved.
We have tested this arrangement with the waterproof plugs being removed and a XLR plug/ socket being soldered on. Our tests indicate this works well and makes connecting a lot easier. The problem is the connector needs to be kept in the boot with this arrangement as the XLR connectors are not waterproof. They do have the advantage of being built to withstand 1000+ cycles of plugging in. We are able to supply this arrangement if preferrred.