Relocate batteries to reduce tongue weight

[RTBabich]

I would like to reduce the tongue weight of our 2009 WW FB2100. There are currently 2 6v batteries mounted on a rack on the tongue. There is enough depth at the rear to mount them under the bed of the trailer in the center near the spare tire. I can make access plates in the bed of the trailer for 2 drop in battery boxes. The boxes would be vented underneath and I know the requirements for cable sizing. I've been searching for an in-floor mount/drop-in style battery box, but haven't found much. Has anyone seen anything like that? In a few weeks I'm going to set up a lever scale to measure the tongue weight and shift the batteries to the rear for a second measure before cutting any holes. I'm thinking moving the batteries from 11ft in front of the wheels to 4ft behind has got to have some effect. It would be a more secure location for the batteries and still be accessible.

[RTBabich]

Y-Guy wrote:
You need to vent the top, Hydrogen will not vent downward since Hydrogen is lighter than air. Introducing Hydrogen into your living area is a bad idea.

Play with the scale some, you're really not going to save that much weight, if you are over capacity you need to consider other options IMHO.

I was thinking to not actually mount the box in the floor, but under it. The box would not be sealed with lots of holes for venting, solid in front for rock damage protection. An access hole in the floor would be edged with metal, sealed with a gasket and screwed down. This is similar to older class-Cs with the battery under the floor that have a flip up panel for access in the steps.
I think the tongue weight is just under max. My calculations show about 100lbs off the tongue.

[Y-Guy]

You need to vent the top, Hydrogen will not vent downward since Hydrogen is lighter than air. Introducing Hydrogen into your living area is a bad idea.

Play with the scale some, you're really not going to save that much weight, if you are over capacity you need to consider other options IMHO.