I suspect that because the beeping and the "CHECK GUAGES" is part of the FORD dash, it may be a FORD problem and not a Gerogetown issue, but who knows?
Did the "CHECK GUAGES" and beeping stop when you started up the engine?
You might try to isolate the FORD and the RV part by turning off the battery switch at the door and see if that helps.
Let us know and good luck.
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain