Welcome to the forums. The wires are probably larger because the Univolt has a larger capacity, along with the possible realization the wires should be bigger in your trailer.
It would be a good idea to get rid of both Univolts, and get a new one. They're not that expensive, are quieter (the 1970's Univolt still hums), more reliable, and treat your trailer's battery better.
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Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
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