I just got a Model S actually, and am considering installing a hitch for carrying bikes. But I would NEVER pull a trailer..
What if I do, and my trailer collides with something/someone, and I become liable for millions in damages, not covered by my insurance...
At least in Norway, how large a trailer you can pull is regulated in the license of the car. For a Model S this number is 0 kg. And insurance covers what the license says.
(IANAL, but Norwegian Tesla forums seem to agree that hitches are for carrying bikes only around here, until Tesla is bothered to officially submit trailer crash tests or similar)
That's an impressively terrible rating for something with the curb weight of a 90s 1/2 ton pickup. I suspect the vehicle could comfortably handle far more considering how much better the power and brakes are than a 90s pickup but they don't want to be replacing certain parts under warranty (my guess would be CVs since the S has plenty of torque and traction to hurt them with).
The underlying issue is a lot of pickups are road queens and entirely unnecessary for their daily workloads, existing as status symbols first and a mode of transportation second.
There's a lot that goes into making a vehicle good for towing, and a luxury sedan is not normally expected to have a good towing capacity no matter how much it weighs.