The roll-off must be placed on a hard surface other than dirt. Gravel, asphalt, and concrete are all acceptable. If the container is placed on dirt, the wheels may sink after a rainfall event and the truck could get stuck. There are many items that are not accepted by roll-off rental companies. These items include but are not limited to chemicals, including paint and petroleum products, tires, and electronics. The prohibition of items is often to comply with laws and regulations concerning disposal of hazardous materials. Roll-off drivers may refuse to pick up loads containing prohibited materials. If the load is picked up, the roll-off rental company may charge the customer additional for cleaning the load and proper handling of the contaminating material. Legal issues Some municipalities require that a permit be obtained in order to have a roll-off dumpster delivered. If the container is being set on private property, most cities will not require a permit. Some municipalities require the permit to be obtained by the customer, while others require the permit to be obtained by the roll-off provider. However, many cities do not require permits to have a dumpster delivered. There are usually prohibited items that are commonly not allowed for disposal, such as hazardous materials, tires, freon appliances, televisions, paint, asbestos, batteries, oils, fuels, and tar-treated railroad ties because of regulations affecting final waste disposal. See also Dumpster Roller container – a similar container, but a hook-lift is used to roll-off the container. Sidelifter – specialized vehicle for shipping containers. Skip (container) Tank chassis Waste container Waste management Demountable Rack Offload and Pickup System – military system used for containerised loads using a similar principle References Waste containers Waste management concepts