Yeah I'll probably post my explanation video early next week. It's a "heavy duty" tarp from home depot. $10 or $15, don't remember. It was next to the painting canvas tarps. I decided to go with solid polls instead of extendable to eliminate possibility of failure and to be stronger/cheaper. The cheaper extendable polls i found were too week, and the strong ones were too expensive. Maybe i'm just picky. But the bungees do a good job of pulling the tarp tight. and to change the height I just move the legs out a bit and the whole side lowers. The polls are galvanized metal electrical conduit. $5 per 10 foot poll. 6 polls total. The only thing that will rust is the nuts and bolts over time-easy to replace. and the tarp is only attached at 2 points. also easy to replace. only had to drill 6 holes. Most of the time spent was on coming up with the concept, picking the materials, and hand sewing the front of the black cover that protects it all. oh and screwing in the 10 hose clamps that hold it to the rack. May replace those with U bolts of something someday. Idk. Super happy with it so far though!