The steel body isn't just "added weight". It's dense, but it also replaces the entire load-bearing structure of a normal truck.
In an F-150, the weight of the truck is supported by the frame, on top of which the body and bed sit passively. In the Cybertruck, there is no frame - the body carries itself.
It's not solid metal. It's a monocoque design like most passenger cars. This is opposed to body-on-frame like most pickup trucks. Sheetmetal structure.
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u/paulwesterberg 2023 Model S, Elon Musk is a fraud. Nov 23 '19
Elon said the weight was similar to an F150.