depends on how much weight you are puting on that. Im assumng that is standard 7/8 or 1' handrail tubing? (0.068 wall if I remember) I probably would have gone with something a bit heavier, probably 1.25 or 1.5" tubing in .109 or .12, because you have to think of dynamic loading if you have a 50 L cooler full of fish and ice it will weigh nearly 100lbs, and thats asking a lot of those struts, it would help to have a bit of gusseting or cross bracing to prevent them from deflecting too much