Whether shore power charges the chassis seems to be another 'it depends' topic... From your measurements - I would say yours does. Mine (2014 Hurricane) seems to as well..
Last winter I ran a laptop from one of the dash cigarette lighters for quite some time before thinking about its power source... It was powered by the chassis (as are all 3 12v outlets on the dash - 2 by driver and one in the 'flip out' desk at passengers seat) - the chassis battery was happy as can be after this...
I need to request wiring (and plumbing) diagrams from Thor for my unit - that will confirm... but hard to argue with a charged battery
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