A cargo loading or unloading system for a delivery vehicle, the system comprising: a storage compartment having compartment portions of an associated vehicle that stores associated cargo received from or delivered through an opening to the storage compartment; a storage compartment system located in each compartment portion configured to assist in the delivery or receipt of the associated cargo from or into the compartment portion; a lift assembly movably mounted to the storage compartment and configured to receive associated cargo from a compartment portion, the lift assembly including a lift assembly conveyor that receives associated cargo from or delivers associated cargo to a compartment portion, the lift assembly includes a platform that receives associated cargo from or delivers associated cargo to one of the compartment portions; and a mounting assembly that movably secures the lift assembly to the storage compartment, the mounting assembly including first and second vertical guide members (126, 128) positioned at horizontally spaced locations of the storage compartment, characterized in that the storage compartment is divided into at least a two high by two wide array of compartment portions; and the mounting assembly includes first and second horizontal guide members (122, 124) at vertically spaced locations that each includes first and second ends that are interconnected to the vertical guide members (126, 128) and movable vertically relative thereto, the platform secured to the first and second horizontal guide members (122, 124) and movable there along between the first and second vertical guide members (126, 128) whereby the platform can be positioned at a selected compartment portion of the array. a storage compartment having compartment portions of an associated vehicle that stores associated cargo received from or delivered through an opening to the storage compartment; a storage compartment system located in each compartment portion configured to assist in the delivery or receipt of the associated cargo from or into the compartment portion; a lift assembly movably mounted to the storage compartment and configured to receive associated cargo from a compartment portion, the lift assembly including a lift assembly conveyor that receives associated cargo from or delivers associated cargo to a compartment portion, the lift assembly includes a platform that receives associated cargo from or delivers associated cargo to one of the compartment portions; and a mounting assembly that movably secures the lift assembly to the storage compartment, the mounting assembly including first and second vertical guide members (126, 128) positioned at horizontally spaced locations of the storage compartment, characterized in that the storage compartment is divided into at least a two high by two wide array of compartment portions; and the mounting assembly includes first and second horizontal guide members (122, 124) at vertically spaced locations that each includes first and second ends that are interconnected to the vertical guide members (126, 128) and movable vertically relative thereto, the platform secured to the first and second horizontal guide members (122, 124) and movable there along between the first and second vertical guide members (126, 128) whereby the platform can be positioned at a selected compartment portion of the array.