Truck Camping: SIMPLE tip for dealing with cold air seepage

Here are a couple of temperature rating options for the outfitters sleeping bag referenced in this video...
-20F Cabela's Outfitters Sleeping Bag - http://bit.ly/2VGOuep
0F Cabela's Outfitters Sleeping Bag - http://bit.ly/2UyNLzA
20F Cabela's Outfitters Sleeping Bag - http://bit.ly/2X4NiC6

I'm off to go check out some ruins in Bears Ears National Monument so I'll catch up with you all once I get back to civilization later this week. I hope you all have had a great weekend!