Batteries dead...won't start

The problem may not be your batteries. I didn't notice the age of your coach, but I had a similar problem on a 2008 coach. The problem was a failure of the chassis ground. Without a good ground, you will be unable to start. A poor ground could allow you to get enough power to the dash to light up your panel lights, but insufficient to turn over the starter.

Finding the ground fault can be difficult and may take a service provider 3 or 4 hours. In my case, the chassis ground had corroded to the point where it was insufficient for high current draw starting.