I created a first release of this Tesla Car plugin. I test it against a Model 3, but it should work for the S and X just as well. You can control many of the same remote options as from the mobile Tesla App.
It is in the Vera App market, and available in the ALTUI App store.
If you want to look at the code and (once done) the documentation look here https://github.com/reneboer/vera-TeslaCar.
Still looking at good functionality to add, so suggestions are welcome. Just as bug reports.