I have just bought Lesco's LA4800 Pull-Type Aerator with split axle. I have three customers lined up for tomorrow. This will be my first time using it. The manual says the weight is 225 lbs. with empty weight tray. I can put 5 concrete blocks on the tray which will add approx. 200 to 225 lbs more. I could double stack the blocks if needed to add another 200 to 225 lbs. Customers were advised to water their yards in the morning. We have not had rain in over a couple of weeks. Little then. My question is how much weight should I have available to add on it need be. What should an acceptible plug length be? I will be pulling the aerator with my Exmark Lazer HP 52" and 23 HP Kaw. What other advice can you give me about pulling an aerator? Sprinkler heads will be flagged before starting the aeration.