Why not use 12 volts for your camper. 12v items are more and more available today . Microwaves, a/c , will require a generator /or shore power anyway. TV 's are 12 volt, lighting and most everything e...
If an owner has some solar charging and increased battery capacity, either 12V or 120V power is available and free. Using an inverter and a transfer switch is probably easier to install than wiring for large draw 12V devices. About the only downside is having enough battery capacity.