Camped Easter weekend 1st time...chilly...sunny ...no rain...heavy frost that nite...bright morning Sun next day...noticed not really a leak but a line of condensation inside just above power shade in front window...barely noticeable...but worrisome...have since had heavy rain snow etc and no leaks or condensation General RV says nothing to worry about... ???
Condensation inside an RV is very typical when you're all closed up running the heater.
People exhale a lot of moisture and the furnace does nothing to get rid of it. Typically when we're camping in cold like that I'll crack a roof vent to allow some of the humidity to escape.
The line of condensation just indicates that that spot on the wall was colder than anywhere else. Usually because there is a frame member there (the metal framing conducts heat/cold more than the insulated sections). On a good cold morning step outside the camper and look at the outside wall, usually you can make out all the framing because those sections are colder than the insulated areas.