Re: Anyone Consider ONLY One Battery
The brakes on our 2012 are connected to the trailer battery.
You can demonstrate this by pulling the safety pin that normally connects to your tow vehicle from its switch while the trailer is parked and not connected to the tow vehicle. You will hear the brake magnets apply.
By the way, do not leave the pin out as this sucks the battery down at a good clip (ask me how I know..).
Barely getting by, towing our 16' Bambi with our Ram 2500 CTD "Moby"!