"What's a t-post"????
What, you guys born in a mall or something?
Steel post shaped like a "T" viewed from the end....
This should be enough to give the basic idea.
I stored canopies on there from several different pick ups I've had over the years. Most recent one has stayed on the back of the truck though.
I've got to move this for current use or do a little trimming. My tree is finally getting large enough to be a space occupying lesion.
My brother built a similar one in his yard and other than looking 'home built' and tending to collect junk like this one has recently, they do the job very well.