The only thing that can stop condensation from forming on your windshield is proper ventilation. The problem is that in the Winter, most people want to keep things closed up. All of the moisture from your body, the shower, the kitchen, plus what is generated by your propane stove, remains in the coach and will be deposited on the coolest surfaces, which are usually your windshield. You will also see moisture on your other aluminum window frames, even if the glass is dual pane.
Using electric space heaters HELPS to minimize this moisture and fans directed at the windshield also help, but it is tough to remove most of the interior moisture during the Winter.
It helps if you put towels at the base of the windshield to absorb the moisture so that it does not damage your dashboard.