If I broke CV's or other items I would carry spare parts and the tools to change them but that isn't they type of wheeling I'd like to do and I try to keep up on maintenance. One benefit of traveling with like vehicles is that someone is bound to have what you need and or know how to do something you don't. Between a couple rigs it's possible to keep them all going one way or another.

Unless you're with Ken it seems like. All you can do is try to get him drunk, eat his gum and maybe BBQ him if things get really bad

On a daily basis or quick day trips I throw a duffel in the back with assorted items. None are tools but just stuff to rough it for a couple of nights or maybe help someone who is stranded, may become stranded or unprepared.

Flares are great tools. They can be used for signaling, fire starting, safety or starting an impromptu BBQ of unprepared wheeler.