How much of battery weight transfers to tongue?

RBPerry wrote:
Wouldn't it depend on the length of the trailer? It seems to me the further back the trailer axles are the higher the percentage of weight being transferred to the tongue.

See my formula above. It's the distance from the center of the axles to the batteries and hitch that matters. Assuming the A-frame for the hitch is identical, yes a longer trailer will typically have more of the weight go onto the truck.