Thanks for the comments!

George - Yes, static load is the correct term. The brackets are held in place with 1/4" lag bolts - 4 on each bracket. The panel itself in held in place with 9 1/2" lag bolts 4 1/2 inches long. It's been up for 4 years and is still solid. I wish I had taken a pic of the back side - there are a lot of bolt heads!
LBD - sorry, only Harbor Freight clamps here