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The real top speed of the Model S

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Tesla Model S officialy does not have any towing capability - towing not allowed. It is not limited by max power/torque but with motor cooling i.e. average power/torque.
MS60's and MS85's 'propulsion force' in the 'constant torque' speed zone is around 2,680 pounds (MSP 3,660 pouds).
Normaly loaded MS85 weighs ~5000 pounds, so that 'propulsion force' suffices to move the car up 32 degree incline or accelerate at maximum 0,54g (MSP at max 0,72g).
But one cannot drive using all that power for more than a few seconds - car accelerates to some high speed where driver needs to step off.

Towing a trailer is whole another story. What if you needed to drive up a steep curvy road at speeds up to 20 mph towing a 1000 pound trailer? And stop a few times in the middle of the hill and start again?
ICE cars have built in 'fail safe' - if the (starting) load is to big they simply stall and no real harm done. Electric motor would also stall but it does not have automatic 'poweroff' - it just mimics short circut - where all power goes into heating. Computer detects this and shuts off the current.

Two motors would have twice as much 'breating room' as a single motor. Really enough for towing loads? Hard to say but better than a single motor nontheless.

And lots of cars sold in the USA have 'NO TOWING' allowances in writing, but the same cars in Europe have 1500 pound or more tow limits.

So just because Tesla says 'no towing' doesn't mean the mechanics of the car are incapable of towing.