Here I demonstrate how my tarp system works and how I built it.
How to find pivot and center point for your trailer: ua-cam.com/video/Bymtwr-tzrk/v-deo.html
Materials needed -
2 Hood Spring Hinges:
Driver Side - a.co/d/7L4w1PM
Passenger Side - a.co/d/0WcI6VQ
2 Hood Latches:
a.co/d/9IOE35S
3 Conduit Pipes:
www.homedepot.com/p/1-in-x-10-ft-Electric-Metallic-Tube-EMT-Conduit-101568/100400409
2 Conduit Elbows:
www.lowes.com/pd/SteelTek-1-1-4-in-x-90-Degree-Silver-Galvanized-Steel-Structural-Pipe-Fitting-Elbow/999930922
Additional things to take into account-
Some pieces of angle iron for support brackets
Self taping screws for attaching tarp to conduit pipe
Washers
A decent welder
Bolts with lock nuts to attach conduit to spring hinges