Your right Ron.
I checked my notes and it is 6 inches to the face of the solar panel.
And the panel is 1.75
So 4.25inch standoffs approx for me.
I'm sort of thinking something along the lines of roof racks.
With bars that go from side to side and the panel attaches to the bars.
And the bars are attached to standoffs.
But the bars need to be aluminium probably.
And the standoffs
There is a TV antenna that I never use in the way.