The invention uses a multiplicity of stacked storage racks at least one of which is inclined wherein each rack is equipped with a powered mechanism for deploying and retracting a large diameter drain hose or vent hose. The at least one storage rack that is inclined is used to store a large diameter drain hose such that a flex is formed in the stored hose which is at a lowered elevation than the uncoupled end of the stored hose. By this means a stored large diameter drain hose can transport, and not spill, fluid from a previous use.