Crazy Wolfgang

Crazy Wolfgang is an eccentric Caravan Merchant specializing in the sale of...junk. His inventory includes random bits and pieces used for constructing weapons, and also a copy of a Schematics for a Rock-It Launcher. He can repair up to 15%, but after talking to Uncle Roe for further Caravan Merchant investment, his repair skill jumps to a maximum of 75, the highest in the game (allowing him to repair items to a max of 85%). Crazy Wolfgang can sometimes be found just outside Megaton and any other place Caravan Merchant stops.

If you resurrect Wolfgang after the investment, he will still have the expanded inventory but not the improved repair skill. This can be corrected by clicking on Wolfgang with the console active and typing "setav repair 75". Uncle Roe will still consider the merchant dead in his conversation with you.

Crazy Wolfgang's local inventory can be found in Uncle Roe's house in the first metal box in the corner. The key can be recovered from his corpse.

Once you full invest into his shop he will sell Pre-War Books. However, these books are blue in color and have a value of 5, and cannot be turned in at the Arlington Library.

Trivia
Agatha includes a shout out to her "old friend" Crazy Wolfgang in her broadcast, saying "no one can scour the wasteland and find such oddities as you".

Bugs
On the PS3, if you have established the Merchant trade route and finished The Superhuman Gambit but did not go past the Scientific Pursuits quest, if you fast travel to Canterbury Commons, and after a certain amount of gameplay hours, Crazy Wolfgang will respawn dead by in front of the town and Giant Radscorpions, or Yao Guais, will come after you.