Solar panels vs shade cloth

The exterior is aluminum, and few things conduct thermally as good as aluminum. My concrete umbilical is painted OSHA white, while the roof is 3" reinforced concrete covered with tar and solid white pea gravel. The bare concrete ceiling on the inside frequently measures 111F. I audited the shade factor and came to the conclusion, due to heat transfer, the entire structure would have to be shaded.

I would have loved to have a 2-axle U-Haul enclosed trailer with side and end flaps clad plus roof clad in solar voltaic panels. Rig in shade, trailer in full sun.