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Would be great to get some controlled estimates. There are many anecdotal tests, YouTube videos, etc. Here[1] is a typical example where a Tesla Model Y tows two bikes and trailer (totaling 1000lbs/450kg) and the range drops to around 40% of normal.

[1] https://www.carscoops.com/2021/02/you-can-tow-with-a-tesla-m...

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I'm guessing that has more to do with the aerodynamics of the trailer than its weight. Electric vehicles are much more efficient at getting power to the wheels than gas-powered ones [1], so aerodynamic drag plays a larger factor in range. The Model Y has a super-low drag coefficient of 0.23, and I wouldn't be surprised if the trailer adds considerably more drag than the car itself.

[1] https://www.fueleconomy.gov/feg/atv-ev.shtml

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