I did order this pig tail and when it comes, the best case is that the flat end will fit my controller, but may not, per the contact at tweety's. If not, I will just splice that pig tail to the pig tail that I have that came with the controller. I, too, was going to going to cut out the female end under the dash and splice my prodigy pig tail, but, the wire bundle for the controller is bound up so thightly with a larger bundle and so little of the end was sticking out that I had no room to splice. I just didn't want to get into unraveling the big bundle. You are right that it is an easy job which I have done on previous MHs. You are also right in your original post that this pig tail is harder than it needs to be to find. Just from talking to a couple of sources that installs brake controllers, I think that it may be a more common practice than not to do exactly as you did. Thanks, and nice talking with you.
Rusty and Katy
11 Tour 42QD, 07 Chevy Silverado LTZ 4X4