Don't mean to double-post, but this might be useful in the "mods" section.
I saw a few posts regarding battery monitoring and remembered that I installed a system in a sailboat I had a few years ago. Battery monitoring was pretty important to us while staying on the boat for a few days. Dry camping is very similar, so I've decided to use a device from the same manufacturer in the Roo.
These are a bit expensive, but I can tell you from experience they work extremely well. Similar in functionality to the Trimetric.
(this is the system I installed in our sailboat)
(this is what's going in the Roo)