My trailer (a Jayco fifth wheel) has three connections at the positive battery cable: one to the converter and interior fuse panel, one to the landing leg jacks, and one to the breakaway switch to the brakes. I believe that there is only one ground wire, to a grounding buss. If you were to put a battery disconnect on the single negative cable, the breakaway brakes and the landing legs would be disabled. So in my case, a battery disconnect on the negative cable is definitely not a good idea. Other trailers may be wired differently.
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There's lots of advice and information in forums... sometimes it is correct. For example, all of my posts are made by a political appointee who got the job as a reward for contributions to my diesel bill.
2011 Jayco 28.5RLS; 2021 Chevy Duramax; Pullrite Superglide Hitch
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