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Allot of people I know have used simple switches. I prefer using an automatic battery isolator. My plans call for an automatic battery isolator and carrying a big honking blade switch as backup. If the dual batteries are not right next to each other, then fuse the + wire between them at both ends as either end is a potential source. Throw into your spares kit extra fuses and a big honking blade switch you can substitute in if the isolator fails. If you go with a solenoid, carry a spare or two. The thing to remember about solenoids is they need power to actuate. You can get latching ones that only take power to switch, but I don't know of any rated in the 200+ Amp range. Regular starter solenoids were not designed for continuous operation and their coils may fry if you leave them on to long. I don't know which automotive ones people have had good luck with. Personally I'd look at Toyota and Mitsibushi Fuso units as they are generally available world wide.
I have no knowledge about the company you posted linked to. I'd search for reviews and customer statements on the web.
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Sanity is for WIMPs.
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