After talking to the CHP, I found out that the plate that has the month and year needs to be in the front. Just opposite of a car. I just finished installing both plates. A piece of cake.
What I did was to purchase angle iron "perforated" that was 1/8 inch thick, with sides that are 1.5 inches. I cut the angle iron to a length of 11 inches. There are two existing holes on the top of the stock bumper, so I just bolted the angle iron to the existing holes. Then bolted the license plate to the other side of the angle iron. Of course I painted the angle iron flat black so it blends with the trucks paint.
On the back, I had a two inch wide by two foot long flat piece of aluminum. I took out two bolts from the mud flap frame, and installed two longer bolts along with spacers. Then I drilled holes for those bolts, and holes for the license plate into the flat piece of aluminum.
Then just bolted it together. It looks great, and did not require drilling any holes into the truck.