The spec is for a 2" ID aperture - that way EV can quickly hook on to your vehicle with their tow vehicle without having to resort to various J-hooks that fit the factory opening (or in some cases, openings in the undercarriage). Its all about speed in collecting your car in an emergency. Every tow truck worth its salt has "the right stuff" on board but with a herd of nut jobs whizzing by your disabled car on a racetrack, that EV worker is more concerned about moving you NOW rather than searching for the proper hook.
In other words a 2" ID aperture is sufficient for most any tow vehicle hook from a tug-em strap to a winch hook to collect your car ASAP.
Not trying to piss in your Wheaties but having friends who run a towing service AND EV, I hear this drivel constantly - it must have sunk into the dark recesses of the cavity that I call a brain.
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Ok, that clears it up, thanks.