Jerry,
My personal opinion is rather than change back, I'd have CAT do a coolant analysis every so often to monitor metal content. An oil analysis won't tell you anything about coolant contamination unless coolant is getting into the oil. There have been a lot of radiator problems but many of those may be due to a combination of ELC and the AL radiators Monaco used for a few years. I can't argue with Dave's advice to run what it came with but on the other hand there a lot of us who have converted to ELC with no reported problems. Keep in mind that the coach manufacturer supplied the radiator and coolant and green is a lot cheaper than red. In any case, in the final analysis, guess it's up to what you feel comfortable with.
Steve