Bruce:
You are not going to believe this: I leave the vehicle home on Wednesday's to get the interior cleaned with the rest of our house. My wife went out to check how cool the interior was after turning on the roof AC, to find that it had not cooled at all! I called the the dealer the next morning, and he said he would replace the unit in about an hour this morning and I could wait on it. Oh yes, I thought the mildew was stronger when the hot air was coming out of the AC!
I arrived at the dealer at 8:00A.M. this morning, and at 9:00A.M., I was driving out with a new AC unit. The dealer also replaced the thermostat on the hot water heater, because I didn't think it was getting very hot.
The mildew odor tonight is GONE! I was going to wait for a couple of days to update, but the difference is so dramatic that the AC has to be the primary offender! My theory - I had noticed that the AC froze up a couple of nights when I had the fan on low. I had thought that I needed to run higher fan speeds when the ambient air is around 70 and humidity (hello Texas)is high. Turns out that freon was low from the beginning. I suspect that some parts of the coil were freezing much of the time trapping moisture in the unit, causing mildew! I had pulled off the cover once before, but couldn't see any spots - they were probably inside the coils.
So, as it stands now, I am about out of complaints. I am still syphoning water out of my tank, but I believe I have a fix for that and will report on it once done.
Did you get a stereo? Also did you ever find the errant led for the hot water heater? What kind of mileage did you get on your trip at what speeds?