KACOLA
A house battery stores power for lights, pumps and electronics when you are not plugged in. If you always camp with hookups and already have a healthy battery, you may not need another.
RV, van and boat owners who run 12V systems.
KACOLA High Current Battery Disconnect Switch 300A, 12-24V Master Battery Power Cut Isolator Kill Switch with Face Plate for Car, Vehicle, RV and Marine Boat, Prevent Battery Drain (ASIN B0BG559VHL). Amazon's page has the current price, specs and reviews.
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Check current Amazon listing (ASIN B0BG559VHL).
Fine print: The Dude has not personally tested this product. The details on this page come from the Amazon listing and can change; check the listing for the current specs, price and availability.