Our solution (since we often are out alone) is to carry enough tools and know-how to diagnose a problem, some parts, and a small dirt-bike to run to a town for other parts if necessary. We also carry satellite internet connectivity, which can be used to make phone calls.
The only major break-down we have had (sudden engine failure-to-run) was while we were on a county dirt road. Although the tow was expensive, it was still under warranty, and clearly fell to Ford to deal with it (although they were very non-committal till the problem was diagnosed).
I've been trying to put together a list of the tools we do carry on our web-site
here. The list is constantly evolving, but has been sufficient for broken hubs, spring replacement, roof lift mechanism fixes, etc.
For parts we carry spare belt, few gallons of oil, transmission fluid, ps fluid, brake fluid (incase we get a leak in one of those systems), a few pounds of spare bolts & nuts, etc.
Also the service manual can be invaluable, they are expensive, but so very worth it when you need it.
-e
Sportsmobile (AKA Money Pit)
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