I am contemplating adding either a Victron 15 amp dc to dc battery charger or a Victron IP65 charger 15 amp to my existing RV setup. I have a Travel trailer I pull with a Nissan Titan that has a power outlet in the truck bed that can provide 400 watts of AC and is controlled by a dash switch. It would be fairly easy to just plug in the IP65 charger and run a wire to my trailer to be able to just hit the switch when driving and supplement my power to my batteries. But maybe I would be better off for some reason to get the.dc to dc charger and run my own wire from the battery of the truck to the back and then connect my trailer to supplement my power? I realize that with the IP65 charger I am converting from DC to AC back to DC and the efficiency is not what a dc to dc charger could provide but the end result seems to br 15 amps dc going to my batteries either way or am I missing something? Who knows, maybe the Alaska Summer sun will provide all of the solar power I will need…..