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I'd suggest a full size spare or at the very least, a tire without the wheel. In some places a replacement tire is a next day service after the morning supply run. 20" tires just aren't in stock in the city (especially a matching one), let alone BF Montana.
An AAA card or equivalent and I'd pay the extra for the 100 mile towing, just in case the Chevy tow to the nearest dealer doesn't curl your toes... as the nearest Chevy dealer may not be convenient.
I'd also get a power inverter, to charge tablets, camera batteries and such on the way.
As always stuff happens and think about what your tolerance is.
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