I forget what size is the most popular, 8 by something, but they are plenty big for a v20. If you want basic and simple, its hard to beat Bennett hydraulic tabs, If you want indicators and auto up function, Lenco has a better setup. I've replaced a bunch of lenco actuators over the years, have only replace two bennet hydraulic cylinders. Bennett electric haven't been on the market long for me to have an opinion. If you leave the boat in the water, use hydraulic tabs. Boat levelers are slow to react. K planes are the best, but are serious overkill for a V20