Actually, there is a way to use that on multiple vehicles which are within the years of the tuner's parameters.
Plug it into a laptop or desktop.
There should be a port on it somewhere. Mine came with a USB cable but it's...where? (Doh!)
The cable for my camera happened to be the same! Once the 'puter recognizes, go to the manufacturer's website & hit 'update'.
Not only will you get the latest software updates, but it will also zero-out the programmed vin.
Now you can use it on another vehicle to set whatever. Tire size, fuel grade, rev limiter, etc. etc.
Once that's done, go back & repeat that 'update' process in order to remove the second vehicle's vin.