Huh? I presume the difference is that the battery disconnect which comes with the trailer doesn't actually disconnect everything (some things still connected include the LP detector, CO detector, etc.).
If you're pulling cables off of the battery, it makes no difference whether you pull the positive or the negative cable. Either one (or both, of course) will completely remove the battery from the trailer.
Even with the above, the battery will still discharge over time on its own.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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