How many of us are there? Owners of Dodge based RV's?

Check the oil on the dipstick again. Water in the crankcase causes the oil to look like muddy coffee (i.e., coffee with cream or milk).

Short of doing a compression test, it sounds like your heads and head gaskets are okay.

It's increasingly sounding like your coolant system needs to be "burped" to get air bubbles out of the passages.