Most of the weight goes .....duh......on the step. So the main gear should be near there, about where the mains are if you have trike gear. You don't want to put one set of struts waaaay back and one set waaaay forward because it will put a large bending load in the floats. And if the floats fracture it will likely be at the step because...that's a NOTCH! (that's where MY floats always break, anyway.