Gives a lot more functionality for campervans and the like, but not sure you'd need the benefits in a cab heater. Incidentally, the one pictured isn't designed for fixed installation, so best avoided for the Red Goddess.
Sometimes, others may not understand why you like a car so much. Sometimes, you may not even understand why you like a car so much. But none of that matters; all that matters is that you like the car, and having it makes you happy.