I believe what you are referring to as a battery isolator is in most diesel equipped trucks that have two batteries under the hood . one for starting and the other for lighting system.
a trailer that would be often taken off tow vehicle would only charge when traveling when you unplugged the connection between the tow vehicle and trailer it would be isolated.
Starting the tow vehicle wouldn't have much effect on the winch battery, at least not enough to worry about.
The wiring diagram is good for any trailer that has that same plug and if you hooked up backup lights even if you picked up one that didn't hav B/U lights it would still work without a problem.
You can even get a 4 wire Flat plug adapter for like a boat trailer, or utility trailer and your same plug will work.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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