Edited to remove my terseness.
It's possible that there is a fire alarm or carbon monoxide detector that need to have their batteries replaced. Are you trying to avoid buying a battery? The main 12v battery is likely necessary to have. The electric trailer brakes (if equipped) will need a good battery to work in case it becomes disconnected while travelling.
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Current:
'17 Winnebago Vista 31BE / Wife, pesky Eski and loco Toto dog
Former:
'15 Open Range 256BHS / '05 F350 CCLB RWD V10
'14 Keystone Passport 238ML / '13 GC Trailhawk Hemi
RIP Birch (pitbull)
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