For those who may be interested, here are a few photos of the installation:
The panel is mounted, but the cables have not been run yet.
The cables run down through the roof...
...along the edge of the window trim...
...and into the front storage box.
From the controller, the cables to the battery only have to run to the nearby 12v outlet.
We are going to do some boondocking this weekend and see how well the panel performs. So far, even though the trailer has been in the garage, the charging light is always on during the day.