So the down poles are 2 piece and not adjustable, they are optional. The awning is functional w/o them but a wind may force the awning down w/o them or make it flap.
I just put the side poles on and then use the guy wires attached to the truck to snug them to the ground.
I experimeted w installation but ended up drilling through the aluminum shady boy case and threading the four treks bolts into the fourtecks mount.
Set up is pretty much like any tent. Hard until you know what poles go where, then pretty easy once you have done it before.
Case is 4 feet. Material is attached across entire case. It folds over twice. total is 10'opened.
Check out the cheesy video on right lower side of following webpage for set up