AAA fits in the wallet and is available where ever you can phone from.
Perhaps a SAT phone is the only tool you'll ever need.
I wonder if there is a consensus on items the fail somewhat predictably or commonly and from that list pick the things that you can carry spares for.
I can think of these from what I have read:
- IMS Bearing
- Ignition Switch
- Headlight Switch
- Airbag issues
- Fuses
- Top gets stuck up or down. Limit switches fail.
I personally only carry AAA card, Cell Phone, spare fuses,flashlight and a swiss army tool/leatherman in the car
I figure that with those I can make a determination whether to drive the car any further or flatbed it home.
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"It broke because it wants to be Upgraded

"
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)