I asked Marathon how they weigh their coach and the salesman told me with tanks empty,diesel at minimum,no one in the coach including the driver.
That's interesting, when I purchased my current Marathon, I asked the saleman this same question, because he had given me the Marathon weight values. I told him I assumed that this was empty weight.

He told me "no, that's full water, full fuel, and two passengers in the front of the coach".

I wonder which is true, or if practices have changed?

Ray