Ive wired a few that way, with the starter solenoid in the back so the main cable is only hot while cranking. I use 6 gauge from the shut-off switch to the alternator, with a pair of 80A fuses in parallel. The car feed, I use 6GA with a 200A breaker, feeding a terminal block that I use to feed vehicle power. I mount the breaker on a vibration proof mount so it won't trip from tire shake, etc. It's a little more work and more parts, but if the customer is paying, they get what they ask for within reason.
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