Just a note or two to my neighbors down south (I live in Casper).
1. If you have fuel cans, bring them. Make sure you fuel up in Cheyenne, as the next fuel stop north of Cheyenne is Wheatland. Unless they have tanker trucks there ready to put fuel in the ground, they probably only have 50,000 gallons or so of capacity (5000 10 gallon vehicles and it's gone!). Next stop with reasonable amounts of fuel is Douglas. Once you are in Casper, if the fuel trucks can get around, we have a refinery and virtually unlimited fuel. For those coming up through Laramie, fuel there, and be prepared for no services 'til Casper.

2. The rest areas will be overloaded, and so will the out-of town fuel stops to the point their septic systems may back up. Bring a shovel, and toilet paper, as you may have to improvise a latrine.

3. Pack some MREs, or other travel food, and water, as I do not believe you have a decent chance at food until Casper, as the small stores on the road will empty out soon.

God Bless