fascinating, i've never seen a usb > 12v device nor thought that it would be a good idea... and from my electrical background, it's not.
.8amp max (meaning less than 1amp even for startup load) is pitiful, I'd hope it's internally protected not to blow your usb port.
on the note of the "ion generator" is it one of those 12v stick things w/a blue light in it? because that doesn't generate anything useful (do your research), if you want to protect against covid in the truck beyond a mask, get a UV / hepa air filter system and plug it into the trucks 120v outlet