condensation on windows
Besides cracking the upper vents open a a bit a couple of things to consider:
1. Buy a small squeegie and periodically (like before going to bed) wipe the water off the windows. This way they have to start again from a dry state before condensing up again
2. Up here in Alaska we have a special type of insulation which is a cross between thin bubble wrap and aluminum foil. I forget the name of it--we usually use it in the summer to darken the inside of the RV enough that we can sleep (one undesirable consequence of 20+ hours of summer daylight). If you have the kind of RV curtains that are fastened to a track or something at the bottom, then you can insert the insulation between the window and the curtain, and the curtain will hold it in place. You can't see through this particular type of insulation, so you remove and roll it up during the day. As room darkening doesn't seem to be a concern for you, you could probably even experiment with clear bubble wrap.
Condensation is caused by two things. You have warm moist air (which Gary's suggestion of opening the roof vents a little will help dissipate) contacting a cold surface. Window glass is a lousy thermal insulator, so your windows are the coldest surface inside your trailer; but stagnant air (like what is found between thermal window panes, in bubble wrap, or inside foam/fiberglass/blown insulation) is a pretty good one.