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The UK has a 4.25t gross weight limit for "alternative fuel" vehicles - i.e. electric vans and pickups with heavy batteries - that allows them to be still counted as "3.5t" vehicles for licensing purposes.
And the rated payload is just a made up number that they can be fudged downwards on the paperwork to fit the vehicle under a limit. It's not like anyone's going to put anything in that bed anyway.
https://insideevs.com/news/699164/tesla-cybertruck-might-never-make-it-to-europe/
i think the uk cat B license is 3500kg gross weight rather than kerb weight.
anyway, that was boring. i hope they don't ever get sold here, but i'm sure some nice individual will find a way.