Abstract: The invention relates to distribution systems and methods of their use. In some embodiments, the invention relates to a truck and trailer comprising a platform that is configured to allow movement of containers including, but not limited to, a tank. In some embodiments, the invention relates to chemical distribution units that are configured such that a plurality of chemical tanks, together or individually, can be moved partially over the edge of a platform, including but not limited to, over the edge of a trailer. In another embodiment, the invention relates to a chemical distribution system constructed on the deck of a trailer comprising first plurality of chemical tanks and a second plurality of chemical tanks configured such that the first and second plurality of tanks can be moved sufficiently over the edge of the trailer deck to allow a person to access the top of each of the individual tanks.