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The point is strong, but all the force is concentrated at that one spot. A normal flat roof would still be basically made by 2 triangles at each end with an upside down triangle in between spreading the forces over a bigger area.
I don't think that newer battery tech is going to be ready and for what would have to be a reduced cost in time for what Tesla is claiming to start production in what 11 months? Even 2 years it's not going to be ready. Face it, this truck is going to weigh 6500 pounds at the low end
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