Sightseer 2002 P32 won't turn over or start

[rhutch]

I have a 2002 P32 Winnebago Sightseer. Recently while parking the vehicle I went from drive to reverse and lost all power. Have run through battery/electrical tests with no luck.
Have power to the ignition switch but no power to dash. Won't turn over or start. Any ideas on what might be the issue would be appreciated!