Just got back from a week in the Southern California desert and finally used the Kelty Car Tarp I bought this last winter. It worked really well.
had a series of hooks along the passenger side that I figured and been an awning
attachment at one time. When I saw the Kelty Car Tarp and that it attached to the car rack of a vehicle I thought I could make it work. And work it did. Gave a large area of cover and has a variety of configurations. I did decide to get 2 more poles to give more options and may try to figure out how to attach to the frame of the pop-top. But for about $100 bucks it works well for my set-up.
Kelty Car Tarp - Free Shipping at REI.com