Ok, I found a web site on the subject but this is about home window. I want to do this on my dual pane on the MH. I do not want to change the windows. http://condensation2clear.com/?gclid=CNu6zaiuwMECFQMT7Aoda2gAQw. I know a guy that does it in my home town and it works, even at minus 30 in winter.
After drilling a hole, they install a one way valve so air will escape and not go back in, creating back the thermal barrier.
RV windows are tempered, check with RVfogdr.com. This is why the guy I called says he cannot drill through, but he says it will work if I drill in between, problem is I cannot install the valve and I will loose the thermal barrier. But this would be the least of the problem.