I've used the round knob type on our rv...one for the chassis battery and one for the house. Installed for several years now and they work well. I bought the ones made in the USA...I forget the name of the company now.... in SC I think it was...
I'd prefer a "marine type", they just seem better quality...but these have been good enough for me.
And I'll second the yes, just one terminal....depending on how the batteries are hooked up. You just need to break the circuit
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