it was part of the trailer when I got it so a bit hard and heavy to get up

but it basically sits on the top ridge of the RTT and is cut and stitched in a way that kinda forms and matches the ridge then starts the slope
the only downside when I tried a large regular tarp for shade that was lighter was when draped over the top and coming down the sides you get some extra material that kinda bunches a bit and does not make a nice tight surface all the way around
does that make sense ?
being canvas type material that has a extra coating on the back the nice thing is that its totally waterproof and no light comes through at all also keeps the RTT much cooler inside
I am actually going to be selling the trailer if you know anyone ?

so want to get some pics when it cools down can lay out the tarp and try to get a pic of it then ? but might be a bit till the temp drops

but might help show you the pitch and stuff
the edges come over and are covered with velcro for sidewalls and have grommets