I use the same set up - dog bone to 120 20 amp. No problem with house batteries since january (when I purchased it) Just had installed a "kill switch" for chassis battery just under it in the front location on passenger size. The battery died and I replaced it and added the switch. It was sitting for four weeks plugged in.
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2016 Thor Axis 25.3 w/ 2011 2dr Wrangler in tow
Demco tow bar with Patriot braking
Bigfoot Automatic Levelers.
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