Sir, I stand corrected. Thanks for the info.Man, there is some misused terminology on this thread.
‘Purlins’ are installed on top of the trusses. They have no factor in this topic.
‘Girts’ are the horizontal members that connect the poles.
No king studs or structural headers are needed.
Thinking back, I built my first pole barn about 44 years ago. I’ve done a few.