Here's my awning rail. I went with 5 pieces for $85... It has a built in gutter.. I used two pieces for one side. Will probably put a line down the other side also...
Check this out at Amazon.com
RecPro RV Awning Trim with Gutter | 92" Length | Aluminum | Made in USA (5 Trim Pieces, Black)
https://www.amazon.com/dp/B081Z7SBRY..._urrfFbMMVF0D8
This isn't required but covers up the screws...
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Camco 25113 Vinyl Trim Insert (1" x 25', Black)
https://www.amazon.com/dp/B0006JLW3Y..._.urfFbRCS0QG7
Note I did 1" self tappers to screw the awning rail to the bus. Before attaching I used some plumbers putty in a roll- same as the camper stuff you buy and put on the back to seal. After installation I also used dicor sealant on the top edge of it. Probably Overkill...
Small rope was used to tie to the tarp through and aluminum arrow I cut into 2" pieces.
Poles are adjustable aluminum and around$50.. we'll see how they hold up. Done well 3 times so far. Well turns out the are unavailable right now. But here's a link to give you an idea. They have a lot of different kinds...
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Ridge Outdoor Gear Adjustable Telescoping Tarp Tent Poles 2.75ft to 8ft XL Rod, Extending Portable Collapsible for Camper Awning Tarpaulin Camping
https://smile.amazon.com/dp/B07BSF1X..._VArfFbSW0AK8X
I bought a 10pk of little aluminum guyline cord adjusters and the work great also! Smaller than I pictured...
Check this out at Amazon.com
DDY Ultralight Aluminum Guyline Cord Adjuster for Tent Camping Hiking Backpacking Outdoor Activity(red Color 10pcs)
https://smile.amazon.com/dp/B013FOVI..._oDrfFbPYJ5DQ8
Note I also picked up some tent pegs to tie down to each corner. Worked great to tie to trees if camping in a shaded area... Tarp is a silver one from harbor freight. Better than the blue or green ones in my opinion.. I might go with a longer one in future. Also thought about trying a shade type which is a mesh... I think would be more resistant to wind. We had a storm blow through one night camping. I took awning down and didn't try it... Lol had a day time storm also a few days later and I dropped one side down and it shed water pretty well. No issues with the heavy rain. It lets a little sprinkles through the gap from rail and where tied on...