The drawers and box are probably 300lbs. The box when loaded is probably, guessing, 700lbs. The drawers are 300 each(made of wood). Add it all up and my guesstimate of 1k lbs is pretty close. I had a chain box I hauled and it was another 550lbs. That didnt drop the truck anymore than the 1k lbs. My truck now doesnt squat when I set the enclosed trailer on it with the 6" lift. The stock dmaxes are squatting pretty bad with the same load. Im not sure what springs a 2500hd dmax has. There is no overload.