I did my 04 Tropi Cal a couple of years ago also changed out the thermostats at the same time. I found the procedure in the Cat manual that came with my coach and just followed that. I have a large galvanized wash tub that I use for oil changes and also used it for the coolant change. I purchased the 50/50 premix. The only thing I really remember is you will introduce air into the system and you need to open the pitcocks on the hose lines until you get a good flow after filling. I had to do this a couple of times after starting and warming up the engine.
Brian, Loretta & Daisy (Golden Retriever)
2008 Holiday Rambler Endeavor 40 PDQ , ISL 400
2014 Ford Explorer toad