When you are using the trailer, definitely keep it in the on position. Most things will not work in the off position. On my trailer, when in the off position, the only things that seem to work are the propane leak detector and the entry light when the screen door is opened. Not sure about the converter though. But the lights don't work, and I like to see at night.
2005 GMC Sierra 2500HD, Duramax 2WD CC/SB
2013 Cardinal 3030RS full body paint
B&W Companion slider, air bags, EFI Live Custom tuning by So Cal Diesel