I ended up taking it to the shop. They adjusted the clamps where I thought the leak was, pressured up the system, but couldn't find the leak. Hopefully that takes care of the problem.
The charged $90 for the coolant and $288 labor. I didn't get to watch them, but I asked how they were going to do it. After draining, a vacuum has to be pulled on on the entire cooling system to remove any air, and then the coolant is pulled back into the system by the vacuum.
I found a video on Youtube "The correct way to fill Truck and RV Coolant Systems" by Adept Ape. His videos are performed on Cat engines, but I think the process is the same.
Randy and Laura
2012 Monaco Knight 36PFT
2016 Jeep Wrangler Rubicon