I edited the decks for the Caravan players who are also merchants:

Johnson Nash
Lacey
Cliff Briscoe
Dale Barton

This required giving Cliff his own deck, as Vanilla has him using Ringo's deck.

*****Installation*****
Drop the .esp file in your Data folder.

Activate it in the Launcher (or your mod management app)

*****De-install*****
Deactivate it in the Launcher (or your mod management app)

Delete the .esp file if you want to. Won't really matter if you don't.

*****Notes*****
Currently I have not changed the AI for how they actually play the game - they still don't know how to play aggressively and attack an opponent's caravan.

I have no idea where the player AI is yet (this is my first mod and I have only spent a couple hours in the GECK total so far.)

So if anyone finds the AI scripting for Caravan gameplay, let me know, and I'll take a peek at it and see if I can improve it any.