I wish traveling merchants would be tougher so they don't get killed by other NPC's/Monstors. Is there a mod that makes them tougher or gives them more body guards?
There is this one: http://www.fallout3nexus.com/downloads/file.php?id=6388
There are many, many mods that make the Travelling Caravans 'essential', 'tougher', or 'respawnable.' Head to FO3Nexus and type "caravan" into the search box.
Or if you want a great all in one mod that you can tweak on the fly inside the game try http://www.gamesas.com/bgsforums/index.php?showtopic=1077839 Also includes an option for tougher traders.