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The SOG System works on the basis of adding a little bit of oxygen into the cassette and venting, it out through the door where the cassette is accessible. This DIY system costs around $20 and uses the vent system in the existing cassette to vent without drilling holes. no need to drill holes through the doors or hook and unhooked as you empty the cassette

I couldn’t find much info but hopefully this will help you start wiring up your 12 pin trailer plug.