DISREGARD my comments... Over come by events...
Roy Ken
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Assuming you are referring to a CONVERTER/CHARGER unit. This is the unit that converts 120VAC from the Shore Power Connection or the Generator if Installed to 12VDC to operate all of your 12V items including lights as well as charging your battery.
The INVERTER (also referred to as a POWER INVERTER) on the other hand converts 12VDC from your battery source and produces 120VAC to operate a few 120VAC appliances depending on how big the Power Inverter is and how many batteries you have on board to operate it.
Most trailers do not have INVERTER's installed by the mfg. This is an optional item...
Roy Ken