My last trailer had two batteries. If you stick with the six volts you have, one of your two big wires to the main battery needs to be adjusted. Depending on the setup and extra wire length, I'd leave the + cable on the same battery position, and run the - cable to the - of the second battery. You will probably need to create a new cable to connect the two batteries together. See previous post. This new cable needs to be the same size as your existing big cables that you just hooked up.
Mine old trailer had smaller wires to connect the second battery to the main battery, which is why I'm pointing this out.
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