Welcome to the forum.
If your batteries are fully charged, and breakers and fuses are all working, you probably need someone to trace down what might be a hidden fuse or broken wire. Of course, this would happen on a holiday weekend. You can try to call Riverstone and see if they'll authorize a mobile mechanic.
Edit... If you have a voltmeter, check to see if the batteries are truly charged. If they aren't fully charged, that could be your problem. If your battery disconnect was on in the rig, it might not have been charging the batteries.
2015 Dynamax REV 24TB class C