'Some might argue they also distribute AC power to any AC circuits on the trailer (e.g. air conditioner, microwave, power outlets), but that happens in a separate fuse box that also feeds AC power to the converter...for conversion to DC.'
Sorry, but this statement is totally false and misleading. ANY power converter/charger found in modern RVs, as we are discussing in this thread, have 2 functions and 2 functions ONLY!
• provide DC power for the RVs many DC requirements, such as operating all of the control or PC boards located in the appliances and other 12VDC loads like lights, furnace, fans, etc.
• provide for '12VDC' battery charging, either as a constant voltage from a Parallax or other 'dumb' converter, or automatic 3-stage battery charging from a 'smart' converter like a Progressive Dynamics.
A converter/charger HAS NO RELATIONSHIP WITH THE 120VAC SIDE OF THE RV other than to be connected to a single circuit breaker that provides the converter with the 120VAC it needs to power DC loads and for battery charging.
A converter draws 120VAC from the 120VAC circuit breaker box while on grid/generator power and powers the 12VDC fuse panel and charges the battery.............THAT"S IT!