My son has one boondock trip to Colorado this summer for 10 days. We installed two 6 volt batteries and led bulbs. His converter will only go to 13.6 so he is using my Megawatt power supply so he can do 14.8 volt charging with a Honda 2000. While we were at it we installed a blue seas battery switch so he could easily shut everything off while in storage. He trashed a couple batteries because it was a hassle to remove the battery cable all the time.
If you consider the power supply route I would buy a Meanwell not a Mega watt, get the 15 volt model with an operating range of about 13.4v or so to about 17v. This will let you have a charging source that will go to a high enough voltage to equalize at times. I consider led a must. He bought cheap ones on ebay for $20.00 for 10. He figured he would give them a try and has not had any problems. Research led as I have notice people complaining of over heating.