Slate app - free or subscription?

[IamSpotted]

With all this, the Slate not having integrated infotainment should be seen as a positive if you are worried about it. There is so much less attack surface available. Possibly by plugging into the truck you could access something, but there is no wireless capability at all as far as we know.
If they did offer a wireless accessory to be able to check status and precondition battery and cab, it would still be a limited device, with limited access, and likely non-functional while driving.
Modern connected cars have cellular, wifi, and bluetooth built-in and active, with audio and data functions. Infotainment is integrated into the rest of the car's functions, which is probably where potential attacks get through.

Again though, while there have been demos of vulnerabilities, AFAIK there have been no actual malicious attacks. An attack would probably have to be targeted at you specifically, takes a lot of effort, and likely physical access or at least very close proximity for a period in advance.

I do agree that the premise of the slate means it should be a more difficult target since it wont be connected like most cars are these days.

I'm more worried about them storing my data securely on their backend systems than I am of the car getting hacked. Car hacking is a thing, but stealing a car is peanuts compared to gaining access to a company's data.