I've got the universal harness and isolator from electical connections.
http://www.electricalconnection.com/wire-harnesses/hrns-trailer.htmI like this style so if you ever change to a standard 4 wire trailer you can drop in the adaptor for this and it you are done. The convertor works as I have it on my car as well.
I spliced in at the large connector on the right side which is for the front to rear wires.
Another post on this
http://www.valkyrieforum.com/bbs/index.php/topic,21535.msg187500.html#msg187500