JT is correct, more data is needed...
The spreaders must be of suff. strength to spread the load. The spreader material and thickness has its own load distribution characteristics. If the spreader were to flex under the load, the load is not uniformly distributed, and one cannot use the full area of the spreader. (being factious, cardboard spreaders) If the spreaders are marginal, then you can only distribute the load using the area of the spreader that is the same as the load, not extended. So now you may have another component which is the actual dimension of the load.
In looking at the running load, I look at this as dynamic load. Dynamic load has a moment arm component due to the height of the load. This is unknown.
Flooring of the ac is designed to distribute the load over that surface area. Flooring is typically shown with a bearing capacity per sq m of dead load. This is important as dead load only assumes dead weight as a vertical component. Dynamic loading takes into account the height of the objects force at vectors, such as the vertical component of takeoff, as well as any sloshing component of liquid loads.
Much like the spreaders, if the load bearing kg/m2 of the flooring is exceeded, then it becomes a point load, not a distributed load.
For calculations sake, in your example, if the flooring could handle 1000kg/m2, the flooring would span the gap, and if the spreaders were of sufficient strength to not deflect under the load, you would use the entire surface area of the spreaders, or 444kg/m for the dead load.
The running/dynamic load is a function of the height, so...