Here is the kill switch I installed on the front of our TT, just a foot or so from our two 6V golf cart batteries. You turn it and remove and then there is no possible load on the battery. EVERYTHING goes thru the kill swith -- even the electric tongue jack power goes dead.
You can see I used an outdoor electrical box and cover from a big box building supply. The kill switch just fit in the box and the cover closes. You can see I use a tiny luggage lock to limit access to the kill switch.
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