you will get MORE drop on a mono leaf w/ the overload because they will unnaturally dearch beyond what they should... creating a funny shape in the leaf wearing it down which will snap over time. Having your leaf spring pack de arched is MUCH safer, and a better ride.
Mike
mine are d-arched and i did it because of the safety factor, and it was cheap, $100 canadian for a 2 inch drop and i didnt have to bring them the leafs, they took them off and put them back on for me........