What's your opinion on page 116 of the current Model S Owner's Manual?
The risk seems to be low since many people have installed a hitch and I haven't heard of any issues. I'm guessing Tesla is just playing it safe by giving the warning for something they haven't tested that could be installed badly by a third party or used incorrectly.
If damage results from use of the trailer hitch, then warranty would have issues. This would need to be proven that damage or failure was due to having a hitch or use of a hitch.
I'm not too concerned. I'm not doing heavy weight towing. I will be hauling my Trains around in a small trailer, a moped here or their for delivery, and hopefully a Teardrop camper once I have some funds saved up to purchase one.
Lets put it this way, I have a old Nissan CUBE (Will be selling it soon), Put a hitch on that vehicle a few years back. Towed a 1,200Lbs trailer, on a 5,000 mile road trip, with no issue what so ever. It even had the CVT Transmission. MPG did drop, dropped down to 27-30MPG from 30-32MPG
And that car is VERY light weight.
In fact, It's mostly liability in my opinion. The Nissan CUBE's owner manual says no towing in the USA. In Europe, it has a 1,500Lbs towing capacity.