What racking layout is shown here? huge carport

[shadetree]

https://www.quicksteelbuildings.com/wp-content/uploads/2018/10/3Single-Slope1-1.jpg

We have the portal frames with columns running East West

Then purlins running North South

Then another grid of racking? running E W Are these spaced at half the length of the panels?

I'm counting 6 cells wide E to West so panels in portrait orientation to the camera? 400W sized units or the XL ones?

I'm thinking the racking rails are not really needed structurally and are there for convenience and universality. Seems like you could just bolt the panels directly to the purlin layer. YOu would have to space them more closely but seems like the rail layer would be far more expensive than a few extra purlins.

 

[WorldwideDave]

Thought some of those looked like the frames of the panels butting together. Maybe some are conduit/raceways for the panel wiring.