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Well, the answer depends on what you are trying to do and how your MH is equipped.
If you are just trying to keep the Toad's batteries charged up while towing and charge them from the chassis alternator's output, then use the existing circuit from the chassis to the 7 pin connector, pin #4. That circuit is protected by a 30A fuse typically in the Ford fuse box. So no need for another circuit breaker.
But if your Toad's batteries are discharged for some reason and you have a separate charging source for your house batteries (separate from the chassis output) like solar or running your generator, then you can probably get more amps from a dedicated circuit from the house batteries to Pin #4 of the connector. But I would also put a 30 fuse to protect the Toad's wiring and use #10 wire.
But realize that you will only benefit from this if you have significant solar or you are running the generator which will power the converter.
So in general, stick with the factory pin #4 circuit.
David
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