Relay's probably the neatest option or an engine cut switch from a car accessory shop (but end of the day your battery will be limited on output)
What battery are you using? Double the Ah and a switch that big will be fine I'm sure
I used to have a camper van conversion with 2 batteries, I had a 32A switch between the start circuit so I didn't use the leisure battery for starting, on a freezing cold snowy day the van would not start so I opened the switch and away it went!! (It was a good month before I bought a new main battery, the switch was fine)
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