If you have any Bullhorn Traps, put one in each character's weapon slot. Each character will have a strength of 12, greater carry weight, and an enormous amount of HP. At first, your character will start to bleed and appear almost dead. However, this is because the character's original HP level is much lower than the maximum. Also, in the character screen, the character will appear to have a Buffout addiction. This does not seem to have any affect, and it disappears as soon as you remove the Bullhorn Trap.