One thing to consider with dual systems is the isolator, especially if using large inverters. Of the two types, electronic or manual, I prefer a large marine manual type (I mount in the engine bay and therefore a wet area) but my recommendation is electronic until you are disciplined in switching.
An alternative to the isolator is a battery that has four poles (two positive and two negative one dedicated to motor start) that would give you the peace of mind of never drawing too much power that you can't start your engine.
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