Hey guys, Long time lurker, first time poster! Here is my query... I need to send a load weighing 10-12kg down two horizontal, parallel, cantilevered, grade 316 stainless steel tubes -- or bars -- each between 3-4 feet in length, 3/4" in diameter, and spaced 85mm apart. What I'd like to know is; in this specific application, would tubes, or bars, offer the most rigidity? If tubes, would a thicker or thinner wall thickness offer the most rigidity?