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I'm trying to make a tiny (3 x 1.6 x 2 meters or 9.8 x 5.2 x 6 feet) shack on a trailer that can legally be dragged at 100km/h aka 62 mph.

I am curious about the frontal force of the wind at this speed (or maybe 115km/h - 70mph winds in windy conditions).

My framing would either be 2x2" wood or 40mm square steel tubing with a 2mm wall thickness.

Which would be better to support the force of the wind as far structure strength goes, or is that not something I should be concerned with?

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    The framing doesn't create the shear (diagonal) rigidity. The sheathing does. – isherwood May 16 at 16:46
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    If you are driving 62 mph, and you design for a 70 mph load ("in windy conditions") that only lets you drive into an 8 mph headwind. Is that a limitation you are willing to accept? – Doug Deden May 16 at 17:04
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    @isherwood Actually, both the framing and the sheathing create the resistance in shear. 2x2 material is not rigid enough to keep sheathing “in line” for large spans (4’x8’ areas). It might be ok for smaller areas (2’x4’ or so). The Code allows maximum shear values based on framing size (and nail size and spacing) and sheathing (material and thickness). – Lee Sam May 16 at 17:17
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    I vote for steel stronger than wood. Steel tubing with plywood or OSB sheathing. – Alaska Man May 16 at 17:26
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    Since this will end up being a popularity contest I'm voting to close as opinion-based. "Better" is usually subjective. In this case, either will work and it comes down to price and building preferences. – isherwood May 16 at 18:05

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