Having just purchased our first AirStream
Hope you have many happy miles/trips in your new AS!!
1) I am interested in how you go about hanging items on the walls
Walls are curved, so I just install pictures/clock/etc on the flat surface of partition walls.
3) Why are there two switches for the water pump: one in the panel over the stove/oven and one in the bath area?
The first time you pull into a rest area while on a trip - and need water in the kitchen, just turn on the pump. Now if your first stop was the bathroom, and you did not turn on the water pump from the kitchen, and there was no switch in the bathroom ------ well you get the picture. These are three-way switches; either will turn the pump on/off.
4) We have a skylight in the galley/living area and I am concerned about the sun and heat on the shade.
Not sure what you mean here --- if it is heat coming into the trailer, you could use a foam "plug" --- pc of foam purchased from Home Depot cut to fit and can be easily installed/removed as needed.