I combined two Amazon racks into one that works for me on the canopy of my 2021 Toyota Tundra.

I wanted something that didn't generate a lot of wind noise or drag, yet would accommodate full sheets of plywood and other longer items.

https://www.amazon.com/dp/B0B8YX2GYJ?...

https://www.amazon.com/dp/B0BR8WSMD7?...

https://www.amazon.com/dp/B01KPJVDO2?...