Help me out here:
Normal
Casita wiring has both the tow vehicle and the trailer
battery being charged by the altenator.
If the altenator quits (and you don't notice the red light), the car runs until its
battery is run down. In the absence of an isolator or diode between the altenator and the trailer
battery, the trailer battery is also going to run down along with the car battery.:cry
If you've disconnected the trailer battery to restart the tow vehicle you've probably just allowed time for the battery(ies) to recover enough to start the engine, but without a working altenator, you won't go far with two weak batteries.
Now if your trailer battery was fully charged, not connected or, in use, it'd be great for emergencies.
What am I missing?!:chin