True story: man came to me with a very nice high end Motor home and the exact same issue you have.
I ask him if he had an inverter (he did not know) well let's look
First door he opened was batteries
next was the inverter
Flipped the breaker from Tripped/off to back on and said 'Go check'
He went in and his wife ask "Does he think he can help"
Husband answered "he's already fixed it"
Suggest you check for an inverter
Breakers may be on inverter (his were very easily found sometimes they are in back) may be flip type may be push in to reset.
May also be a 2nd breaker box somewhere (That's my rig)
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times