Originally Posted by Foiled Again
YOU SHOULD BE FINE WITHOUT A BATTERY as long as you're hooked up
. You DO need a battery when traveling to operate your 12 volt
lights, and keep the control board of the fridge working.
The tow vehicle supplies electrical power to charge the trailer house battery in the trailer, power for normal braking, and power for all vehicular & signal lighting. (using a separate protected circuit for each function provided from the tow vehicle)
While traveling, the trailer house battery is necessary to operate the fridge and interior lighting, as Paula stated.
The trailer house battery is required as a safety device to operate the emergency brake when the switch is activate in case the tow vehicle and trailer disconnect from each other while moving/towing.