It sounds like you like to do some camping off the power grid. Your 23B has its single battery box between the propane tanks and the trailer jack.
If it were me I would move the Propane Tanks as far to the front as I could get them and not interfere with the trailer jack. Then I would mount a couple of battery tray angles across the trailer frames to mount at least two batteries. These will mount on top of the frame and may extent out on both sides.
Adding a metal lockable box is a great idea to keep your batteries safe from thief but not absolutely necessary. TorkLift has a great lockable battery box.
I still use the plastic battery boxes here. I will probably go with a lock box like this one when I upgrade my 2008 GP24 Interstate batteries soon.
We do alot of camping off the power grid off our batteries and I think a minimum battery capacity is around 220AHs. The more the better of course.
The best deals you find is using two golf cart 6VDC deep cycle batteries in series ($70-$80 each from COSTCO) to give you 12VDC. Two of these will give you 220AHs capacity and will allow you to pull 20AMPS of 12VDC CURRENT for around 440 minutes (7 hours time) to drop you down to 0% charge state (10.5VDC). Of course you never want to drop below 50% charge which is somewhere close to 12.0VDC before recharging again otherwise you may start doing damage to your batteries. 20AMPS is a lot of DC current to draw - you probably won't draw more than 200-300WATTS for more than a few hours... We do our highest battery drain between 8PM and 11PM and of course our trailer has a parasitic battery brain of around 1-2 amps all the time. We plan out of power use so that our 255AH capacity battery bank drops down to around 12.0VDC by 8AM the next morning and then recharge our battery bank during breakfast by connecting our trailer shore power cable directly to our 2KW Honda Generator which will use the on-board smart mode converter/charger unit to re-charge our batteries back up to their 90% charge state in a short three hour generator run time. This fits the generator run time restrictions usually found at the camp grounds here on the East side of the US.
Just food for thought...
Roy Ken
