Dual pane windows do not combat moisture issues alone when camping in winter. You will still need a fairly large dehumidifier (depending on trailer size and # of people). I have camped a lot this past winter in our ORV trailer. Had smaller dehumidifiers in there and still rain into the issues with condensation build-up on windows.
With space being an issue we did not want to buy a huge dehumidifier but ended up getting one and it helps tremendously.
After really cold nights. Below 20, we would still get moisture build-up on the bedroom windows even with additional little dehumidifiers in the bedroom. However, it did help mitigate most of the condensation issues throughout the trailer in the wintertime.