Fixed or portable solar?

I have two 150w panels on my roof. It does cause you to be selective about campsites so you have sunlight. The Samlex Set up I have seems to pull a charge out of the fog just fine. After a foggy day of charging when the sun goes down I will usually see the charge is full. Even clouds unless they are real nasty dark wet clouds. For us the only time I would be looking for a shaded camp site is in the summer.....and in the summer I wouldn't be using hardly any battery in the day or the night. Reason for that is we don't have an inverter and don't use any 110v appliances at all while camping. Just lights and in real cold weather we use the furnace to keep the trailer between 55 to 60 degrees at night.