When I get ours ready for winter storage, in its own carport area, I have shore power disconnected too.
I ran lengthened battery tender leads from chassis batteries to the under hood compartment near the engine's battery.
With leads from both sets of batteries, I run an extension with a multiplier on the end, hook up a battery tender to each lead, tuck it all under the hood, tuck the extension cord out of the hood's way and shut the hood.
No worries, I also have the stow switch turned off.
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Rusty
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