When I got my truck 3.5 years ago, it was wired for trailer and it had a 6 pole square. Now I have seen lots of different trailer wirings over the years, (4 flat, 4 round, 6 round, 7 etc.) and I have seen adapters for all of these but never for a 6 square. It doesn't really matter because I wired in a 4 flat, but I was wondering if anyone knows what type of trailer took a 6 square because I have never seen one with it. My guess is either some sort of agricultural equipment or maybe a home made trailer. Does anyone know what the 6 square is for?

Vern