On my "Planter" trotlines, I use 3.5 gallon buckets filled with concrete for anchors. Depending upon where you stop the fill line, they will weigh between 60 to 72 pounds each. I use 1/4 braided nylon rope to (plant) them. Best to put in 20' or deeper water. And you must be careful when "planting" them, as they speed off to the bottom, make sure your legs or hands are nowhere near the rope, lest you be following it downward. I use fender floats. This is not a 2 or 3 night trotline you are setting. It is not worth the effort of setting out, just to pull it in a few days. But when you plant them, they become like suction cups to the bottom. Getting them loose & up are two other tricks, come time to pull them.