Anyone running bed mounted batteries or fuel cell?

[Hazieview]

Hey guys I was wanting to throw some weight to the back of my truck to maybe even it out a little more.

I'm thinking of mounting duel batteries under my bed as close to the tailgate as I can get. Has anyone else done a similar modification like this?

Also I would like to remove the two side tanks and put in a few cell. However I dont want to cut a whole in my bed. I would like to be able to use the original gas doors on each side of the bed so when I pull up to a gas station it doesn't matter what side I'm on.


Well... Anyone got any advice before I get started...?