tow command?
 

I have a 2004 F250. I was wondering if any body has herd of, or
done a retrofit of a tow command system into an earlier year than
the 2005 heavy duties. If so, what all does it involve?

IIRC, you can't retrofit the Tow Command system into an earlier Super Duty. The PCM isn't equipped to handle the Tow Command signals.

Your best bet is to get the best trailer brake controller you can find.