Before the Sunseeker I had a Coleman pop up and instead of buying the awning ($250) I rigged a tarp with two tent poles.
I would treat yours like a tent pole.
Take 2 lines per pole and stake them out at about 45 degrees apart with the stakes driven at about 45 degrees. Use either a line tightening device or a taut line hitch like this.
Chris in Virginia who was also an Eagle Scout
2006 Sunseeker 3100SS/LTD
2008 Smart Passion Cabriolet TOAD
1986 Honda Helix (Original owner)