Posts keep coming up reporting power incompatibilities with Tesla's 15.5v system are increasing. I seriously doubt any other car company will decide to re-engineer their cars around a similar voltage. Also, companies that make auto accessories could care less about making Tesla-oriented accessories.
Meanwhile, portable power solutions exist and are getting better and cheaper by the month. Competition by companies like Jackery, Anker, Bluetti, etc.. is heating up. You could spend $150-200 on an inverter that might be compatible with Tesla, or the same money for a device that you can use camping, in a car, or in your house when the power is out. With 12v, usb, and some with 110v outputs, those might be far more useful and trustworthy than gambling on an inverter that could fail. The only downside might be they would weigh several pounds more.