Not sure I can explain it either. Things that come to mind would be: 1) Voltage drop in the wire and/or any breakers or fuses and connections/splices in the line from truck battery back to trailer battery (but 2 seems a lot) 2) The trailer battery, for whatever reason, isnt achieving or maintainuing the state of charge as the truck battery. 3) A resisitve/burned/loose ground connection at the trailer.
If two batteries are in paralell one would think the voltages would be the same unless theres a voltage drop across a connection or splice or wiring or a ground I guess. If two batteries in paralell arent the same (should be matched in type size brand and age etc) one feeds off the other and thats not a good thing. Still if plugged in when driving the trailer battery should get some charge at least and as long as its unplugged when setting (or a diode) I dont see it as too serious unless excess current trying to charge a weak battery might overcurrent the charging system???
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