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Whether the Van looks like a tall Cybertruck or an Elongated Semi, I think it would probably be within the same size as other cargo vans in the category. For Reference, the Cybertruck is 223.7" long, a long Ford Transit is 235.5" and an extended Ford Transit is 263.9"
If a Cybervan is the same footprint as the long ford Transit, a foot longer than a CT, it might fit in most Supercharger stalls. A bigger challenge might be the cable reaching the charge port--if it keeps the charge port in the wheel well, same as the CT.