This and related discussions have caused me to rethink the advisability of including one of my backpacking 3-person tents (just my wife and I) in my car-kit. This represents an upgrade in longer-term comfort and performance over the lightweight tarp now included. Like any gear, the "best" shelter is what's available when you need it.
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"Things that have never happened before happen all the time." — Scott Sagan, The Limits of Safety