I live in the desert and go 4x4 wheeling.

Here is a list of things that have caused me to be broken down/have problems:

1. Flat tire
2. Power steering belt broke
3. Idle stabilizer started acting up
4. Radiator sprung leak (JB Weld slowed the leak)
5. Radiator hose sprang a leak
6. Alternator stopped working (running on battery power only)
7. Water pump started acting up (engine over heating)
8. Blew a head gasket (dead car)
9. Battery connection bad
10. Battery died
11. Starter stopped working
12. Fan clutch not working correctly (overheating)

The tools to fix these things will vary by vehicle.

A ½” breaker bar with lug nut sockets is a wonderful thing!