HEY GUYS HOW DOES THE UNLOCK CODE WORK. I KNOW IN ORDER TO PUT A CUSTOM TUNE ON YOUR TRUCK YOU HAVE TO BUY A CODE BUT IS THAT LIKE A ONE SHOT DEAL OR IS IT GOOD FOR AS LONG AS YOU HAVE THE TRUCK. AND IF YOU BUY A CODE AND TRY TO PUT CUSTOM TUNES FROM MCC ON ANOTHER TRUCK WITH THE SAME TUNER DO YOU HAVE TO BUY ANOTHER MCC UNLOCK? THANKS