Dumpsters should be level full unless you are placing shingles, dirt, rocks, sheetrock or other extremely heavy materials in the container. It is recommended that 20yd roll-offs be 1/2 full of these items and 30yd be 1/3 full to prevent overloading. Roll-offs can only hold a maximum of 10 tons of material. You are responsible for any overweight fees and fines associated with an overweight load. In addition, you may be required to unload a heavy roll-off can if the driver realizes it is too heavy when he gets to your jobsite.