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I see what you're saying about triangular cross section connectors.

The individual subframe connectors, which are closer to the edge of the body, will likey experience more of a classic bending moment, in which case a rectangular box section will likely be best suited.

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I'm way late chiming in here and I apologize for that, but I want to step up in support of Malloy's opinion.

I believe he has it right when he says that the sub frame connectors primarily experince a bending moment (rather than torsion). The further out from from the driveshaft the connectors are, the more this is true. Think of it this way: take a rectangular piece of sheet metal in your hands and twist it like a car twists when you get on the gas. See how the two outside edges of the sheet metal bends? Yes, there is a torsional component to that force, but it's primarily a bending moment and square/rectangular tube is great for that.

BTW, the best shape for pure torsional stiffness is a cylinder. Think drive shaft, torsion bars etc.

Now, back to our regularly scheduled program

-jr