First off, diesel pickups simply run two batteries in parallel to give more starting capacity...electrically its exactly the same as one battery with twice the capacity.
The trailer charge line normally goes to pin # 4. Simple to check, it should be hot when the engine is running and not when you shut the key off. None of the other lines are hot except when a light or the brakes is active.
The factory charging circuit should have a fuse installed. On my '99, its one of the large fuses under the hood. Look at the list of fuses in the manual, it'll list one for charging a trailer battery, or some similar term.
Here's another link to a site showing the "standard" connections. I checked my travel trailer, & sure enough the battery charge circuit is on pin 4, not on the aux terminal. If you're not going to use your trailer on another vehicle, or tow someone else's trailer, it really doesn't matter.
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