I just installed a Fiamma F65 case awning. Sikaflex 252 is called out in the installation instructions as the primary bond for the 3 curved brackets (there's 2 - 3/16" bolts along to top of each bracket too).
It seems like a very very powerful adhesive, but the brackets are designed with ridges on the mating surface to enhance the holding power too.
Still, an awning rail doesn't have to hold a ~60# case awning driving down the road....but I think I'd still put a rivet/bolt or three in too - i'd want something to hold the rail in place while the Sikaflex cured
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Paul & Norma
2005 Hunter Fat Shadow, 1995 Scamp 16, 2009 Escape 17B, 2013 Escape 21
2022 Coachmen Nova 20C
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