Max Landing Wt is driven by many considerations. The two biggest drivers are (generally) fuselage bending moment and wing downward bending moment. The former is related to the max zero fuel weight of the aircraft and driven by payload.. Wing downward bending moment is driven by the amount of fuel in the wings at landing, particularly the outer wing tanks. The details of these factors depend on configuration, for example low wing vs high wing aircraft. Landing gear are attached to the wing spars on low wing aircraft and attached to the fuselage on high wing aircraft and the loads and load paths are fundamentally different, especially the instantaneous moments when the aircraft shifts from wing borne flight to wheel born taxi.