I'd do some checking on the truck's umbilical connector. On Fords and on GMs, there is an "interlock relay" that disconnects the truck 7 pin umbilical charge line when the ignition switch is turned off. That interlock is there to prevent exactly what happened in your situation.
Even with the trailer umbilical plugged into the truck, there should be no battery drain from the truck battery "UNTIL you turn on the ignition"...
If the RAM trucks are wired the same (and I suspect they are) then you may have a problem with your truck's electrical distribution system.
The "easy way" to determine if the interlock is present and working properly, is to use a voltmeter and check the "charge line" at your truck 7 pin connector. With the ignition turned off, there should be 0 VDC on pin #4. Pin 4 is the first pin "CLOCKWISE" from the keyway. Then, turn on the truck ignition and you should see 12 VDC on that pin.
On some trucks, the transmission has to be in gear for the interlock to function, on others, just starting the truck will apply voltage to the interlock.
In short, your truck battery should be wired to prevent the truck battery from discharging through the trailer, even if the unblilcal is left connected. However, many of us "always disconnect the umbilical if leaving the truck hitched to the trailer, "just to prevent a problem"...
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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