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> Will any electric car let you drive while it's plugged in?

That’s what I was wondering too. Like you, I’m pretty sure the major EVs don’t let you drive while charge, but I haven’t actually tried it.

No, even my PHEV doesn't let you drive while plugged in.

I think you're correct, my Fiat certainly doesn't. That is, however a firmware update away provided the type2 or CCS protocol can distinguish between a mobile or static charger, or be extended to do so. My OP was a slightly off the cuff post to highlight the use of a trailer for say cheap city cars, rather than a removable battery.