I keep a Go-Lite waterproof tarp in the truck, along with some 550 cord and lightweight stakes. This combo is much lighter and more flexible than a tent for short-term shelter requirements. The tarp can also be used to make a more permanent, lean-to type shelter more weather and wind resistant.
While I have a one person space blanket in my pack at all times (primarily as a first aid item), I have also started carrying the two person shelter version as well. It weighs nothing and takes up very little room.
I'd be very interested in tips on constructing various types of shelters in different environments. 
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"Whatsoever thy hand findeth to do, do it with thy might; for there is no work, nor device, nor knowledge, nor wisdom, in the grave whither Thou goest." - Ecclesiastes 9:10
"If simple folk are free from care and fear, simple they will be, and we must be secret to keep them so." - JRRT
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