mrmag,

Check out my post...

http://www.xoutpost.com/x5-e53-forum/...tallation.html

I haven't updated it but the uhaul controller crapped out after about 6 months. It worked fine with my boat but once I hooked it up to the uhual trailer the module blew up and they won't replace it because I didn't buy the warranty.

The aftermarket hitch is great... wiring is a different story.

Would love to help you...

Do you have the back up sensors has mentioned above?

-mrmcreynolds