If your 7 way trailer plug on your truck is properly wired, you can charge/power your trailer with your truck charging system
That's indeed true (Im sure Mark knows all this) and its been done for years including by myself HOWEVER there are some caveats. Based on the size of the wire used,,,,,,,,,, and its length,,,,,,,, and resistance of the plug and connector,,,,,,,,, and ground integrity, due to line voltage drop and net resistance there may not be any huge degree of charging amps pumped back into the house batteries.
ALSO do not try that if the house batteries are Lithium they will draw so much current your alternator may be damaged which is the reason DC to DC Regulated Chargers are used.
Back when I used that method I ran 8 or 10 Gauge wire (overcurrent protection at BOTH ends) including a separate dedicated ground but those 7 pole round plugs and connectors arent the best way to try and deliver high charging currents. As far as charging and loads its best when multiple batteries are placed in parallel they be the same type and design and even age BUT HEY YOURE RIGHT THIS METHOD IS USED AND CAN WORK even if not ideal the way some rookies use it grrrrrrrrrrr.........
Nice chatting with you best wishes and take care now
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