What I bring is largely determined by two factors:
1. How far from home I will be if poop hits the fan.
2. What I suspect/know to be an issue.
If I go to Moab, I may bring a whole 3rd member, axle shafts, and a complete assortment of fluids. However, if I am going to be an hour from home, I will bring a basic tool kit and recovery gear and any spare replacement where I might suspect being a weak link.
Just another .02