How much of battery weight transfers to tongue?

Thanks all. I have been to a scale. Don't have the numbers in front of me. But I am all on top of payload. Just thought I could help it a tad.

But maybe I have used the reserve in the 6v setup more than I think I did.

I'll probably stay the same. Depends on what credit Costco gives on these. They have been taken care of, but are now reading "open cell". I've tried reconditioning with no luck.