Thanks for the replies and I like the Cat program recommendation. I'll look into that since the one analysis I have was done by Cat.
According to the maintenance manual on the C-12 it looks like the recommended oil change interval (light duty) is about 23,000 miles but that is for continuous operation I don't believe it's completely correct for a MH that does ~6K/year. I've never seen a 5K change interval mentioned by Cat.
The tranny is easy, every 4 years or 300,000 miles or so.
I'm still curious about how others use the info on the analysis.