Im at 23k on stock tires for the AWD non beast and still have plenty of tread to go. Should make it to 30k before I hit the replace level. It's an everyday driver with a few excursions on rough roads/trails.
My take on this idea. I used L track fittings that had a threaded boss (3/8 fine thread), some chain, eye bolts and the molle shelf off Amazon. It has 11 inches under the rack and I put pipe insulation on the sided to prevent scraping. It does not swing. L track amazon link.
For the eye bolts...
Just went on the Tesla website and saw they have new round of supercharging voting up and running. Go on and vote for a location that you think would be useful. https://www.tesla.com/supercharger-voting/overview Log in to Tesla and it will let you cast your 5 votes.