If you can get the CG to check the Power Pedestal, please do. Hate to see you have to move to another site as troubleshooting, but maybe.
Otherwise, if you want to dig into it:
- Screw Terminals on all Breakers and Junction Points including In/Around Transfer Switch.
- Splices where Flexible Shore Tie Cable joins Hard Wire inside the Coach. This is a common failure point after high current draw over extended periods of time. Like space heaters in winter, presumably A/C in desert summer.
- Condition of your own Shore Tie Plug.