My 16' CCD came with a single group 24 battery. I replaced it with a group 27 battery (it fit in the same space as the original, with a new plastic battery box, with some modifications). I bought a second group 27 at the same time.
If I'm going someplace with hook ups, I am fine with the single group 27. When I go dry camping, I take the second battery and change it out when the 1st gets dischared. During cold weather when I may need both to get through a night with lots of furnace time, I cable the 2nd battery to the first for more capacity overnight.
If I go for longer than the two batteries can last, I take along my Hond EU1000 generator and a good battery charger, that can get the batteries back to 80% with minimal generator time.
The upside of this approach - no big trailer mods, don't carry the extra weight when I don't need it, flexibility, minimal cost.
The downside - there is more lifting the batteries around when I need to take two.
Bob
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