I finally found an idea that I am happy with for my supports. It's clean looking and fastened at both ends. I made them out of boat bimini parts and 7/8 dowels. If I can go down the lake at 50 MPH and these parts don't break, they should hold up well for this. The dowel slides into the 7/8" Nylon Outside Eye End, there is a set screw, if you want to secure the dowel. I might drill a hole all the way through and use a cotterless hitch pin. This way I can change out the 4 different dowel lengths I made easier. The longest dowel is 48", it holds my window straight up. Here's links for the bimini parts I used.
https://www.walmart.com/ip/SeaSense-7-8-Nylon-Outside-Eye-End-White/44709014
https://www.walmart.com/ip/SeaSense-Nylon-Angle-Hinge-White/44707323
https://www.walmart.com/ip/SeaSense-7-8-Nylon-Outside-Eye-End-White/44709014
https://www.walmart.com/ip/SeaSense-Nylon-Angle-Hinge-White/44707323