6.1 Hemi 69 Barracuda Fastback Father Son Project

How did you attach them?

Funny, I just put a new cover on top and was telling my wife it would be nice to add a few more rafters... I was thinking emt conduit.
My tent is 18'x20' so the roof supports are pretty long.
I drilled holes in the 1X4 and used zip ties to hold them in place, Sorry I didn't read your question carefully enough.