I replaced my old converter with a Xantrex smart charger in my 13 ft. Boler
and will do a similar swap on my present 17 ft. Boler
I've installed a smaller 4 circuit,120 volt , circuit breaker in my trailer.
120 "shore Power" comes into the trailer to the circuit breaker. One circuit supplies power to my regular outlets, another circuit supplies power to my fridge
and another outlet, another circuit supplies power to the battery charger. The last circuit is a spare.
All of my 12 volt appliances are fed from a DC fuse panel which receives power from the battery. When I am "boondocking" the battery supplies all of my 12 volt needs. If I happen to be in a campground with "shore power" I can plug in and the battery charger automatically performs its' charging cycle to replenish the battery. As well, the 120 receptacles will now be operational.
The main difference between using a charger versus a converter is that most chargers require that a 12 volt battery needs to be in the system while a trailer with a converter does not necessarily need to have a battery.
If you know all your camping will be in campgrounds with supplied 120 power then you can simply plug in and the 120 will be converted to 12 volt to operate your 12 volt appliances. No battery required. This then saves you the cost of having to purchase a battery.
If you do have a converter/battery combination then the converter will supply the 12 volt DC power directly to your appliances and charge your battery at the same time.
Either system will work well.
YouTube - Fuseblock Connections_0001.wmv
YouTube - Inside trailer electrical_0001.wmv