Now that we have a few hundred more miles under our belt, I first opened the pressure relief valve and water came out. Then I went ahead and pulled the drain plug out and let it completely drain.
I then turned water on at the source and got water coming out of the drain hole, which told me that the valve that controls water going into the hot water tank was in the proper position. So, with the pressure relief valve still open and plug replaced in the drain hole, I filled the tank until water came out of the pressure relief valve. Then I closed the pressure relief valve, turned on the hot water faucet in the kitchen and let it run until there was no air in the line.
The gas side of the hot water heater has been heating now for at least 30-45 minutes and I am still waiting for it to shut off.
The water coming out of the faucet is warm to hot, but not scalding. I will probably not test the electric side until we get to our destination.
P.S. we are driving down I-5 in a heavy rain hail storm in heavy traffic. It got to the point where I had to turn on the wipers in their fastest mode. All the sudden the passenger side wiper comes off the arm and flies over the cab of the truck.
So, I pull over the to shoulder. No way can I try to exit the drivers side of the truck. So, wife crawls over the center console into the back seat. (she is recovering from knee surgery). I then scoot over get out the passenger side door and as fast as I could pull the arm up so it doesn't scratch the windshield.
Took forever to get back on the road. I call a Chev dealer and he has a replacement in stock. 33 bucks. So I head towards the dealership. Once I got off the highway I pulled over and checked if by chance the wiper made its way to the bed of the truck. Viola there it was.