The water goes down following the front cap and tend to get out through the joint between the front cap and the diamond plate in front of the camper.
We put a 200W heater there and close the shades and that does two things:
1 - Eliminate condensation in the window.
2 - Eliminate the cold draft that comes from that window.
Just don't put the heater facing the window but parallel to it.
The idea is keep hot air moving so the condensation will not happen.
https://www.homedepot.com/p/Lasko-My...-100/202363459
Because DW wants to black out all windows at night, this year we will be testing a second solution...
I bought a roll of Reflectix and cut it to fit that window. it really blocks 100% of the light but since it is insulation, it should work to avoid condensation.... But we have not camped in sub freezing temps. since I did that yet so I can not tell you how effective it is.
But I can tell you that managing the refletix is way more work than the heater....
https://www.lowes.com/pd/Reflectix-4...0-ft-L/3775461