Originally Posted by rubicon327
Here is a shot. Still deciding on exact placement. It is right over the frame rail which is good. I figure as far rearward as possible is best, but you lose all practical functionality of the dinette bench end door.
I agree that sitting right over the frame rail is structurally ideal, although I'm sure further outboard could be managed, perhaps with some bracing assistance. Is there room to shift the box outboard to gain a slice of storage space, and still be able to open the top of the box?
While rearward is preferable to compensate for the outdoor unit of the air conditioning, the batteries have so much mass that perhaps anywhere under the dinette is enough... I haven't calculated the balance, but that can be done easily if you want to measure the dimensions. It is a shame to sacrifice readily accessible storage space, so even a small compartment left behind the cabinet door is an appealing idea.
If space is left in front of the battery box, it could be accessed through an outside hatch, although the hatch can't get very close to the front corner because the body starts to curve... and the vent hose compromises the top of the space unless it turns sharply and goes out the side wall.
I was hoping that two GC2 batteries might fit in a side-by-side box, rather than this end-to-end box, to use less of the bench length. Although the box has two GC2 batteries in it, the label appears to indicate that it is a 4D box, and indeed it looks like QuickCable's 120177 - which they list as both Group 4D Commercial Battery Box
and Dual 6 Volt/4D GC2 Battery Box
- which has enough length and more than enough width for the two GC2 batteries. A more square box (such as the QuickCable Dual 6 Volt/GC2 Battery Box
) would hold each battery with the long dimension across the trailer width, so the dimension along the trailer length is enough to hold twice the battery width... so less of the bench.
Using the QuickCable boxes for examples, this means a box which is 6-3/4" shorter (along the trailer length) and only needs 1/2" more width. Unfortunately, QuickCable's side-by-side dual GC2 box is almost 2" taller than the 4D box, and perhaps too tall for the seat cabinet. Obviously the extra height is not needed for normal GC2 batteries, so QuickCable is presumably allowing for the extra-tall GC2 batteries which are available.