Hi
Never seen a wired up socket on the front of a trailer before. I think that it is the stowage point for the towing cable as the contacts are exposed and not shhrouded in any way.
Have you seen this link
http://hmvf.co.uk/forumvb/showthread...khouse-trailer that show the drawings of your trailer. No rear trailer socket, which is standard.
With reference to my earlier post, I have seen a few with trailer sockets on the rear, but only a very few as it is not standard on any trailers that I know of. Just a thought has someone fitted the stowage socket to the rear of yours for some reason?
Cheers
Richard