Unit Loads Each method has its advantages and disadvantages. Slip sheets are economical, take up little space, and are light. However, the equipment is not universally available, is more expensive, and is slower to operate. Pallets are universally adaptable to a variety of handling situations and locations. However, pallets are costly, take up space, and can be difficult to dispose of. Clamp trucks use no added materials, but the geometry and character of the load must be such that it can be squeezed between the truck's clamps. Most pallets are made of wood, and choice of wood species has a great impact on cost and durability. The denser and stiffer the wood, the greater the pallet's durability and usually the greater its cost. Well-made hardwood pallets are the most durable and cost-effective option of the many material choices available. Other materials are usually selected for considerations other than durability.Unit Loads Each method has its advantages and disadvantages. Slip sheets are economical, take up little space, and are light. However, the equipment is not universally available, is more expensive, and is slower to operate. Pallets are universally adaptable to a variety of handling situations and locations. However, pallets are costly, take up space, and can be difficult to dispose of. Clamp trucks use no added materials, but the geometry and character of the load must be such that it can be squeezed between the truck's clamps. Most pallets are made of wood, and choice of wood species has a great impact on cost and durability. The denser and stiffer the wood, the greater the pallet's durability and usually the greater its cost. Well-made hardwood pallets are the most durable and cost-effective option of the many material choices available. Other materials are usually selected for considerations other than durability