Hi David, to answer your question, the 18 lb. Ramp Activator will handle the biggest load out of them all, of course, but on the standard-capacity machines, the Ramp Activators are still the best choice. The "dip-roll" action is really what makes these machines have such a good working capacity, and it also makes for a lot of splash-drama on lower water levels. A considerable amount of water will leave the machine during the wash cycle! The straight-vane Activators are fun to watch as well and really thrash the load around, but don't hold nearly as much as their ramped cousins.