A flexible plumbing assembly for a vehicle having a main cabin portion with an extensible cabin portion that is moveable between a retracted position and an extended position includes a flexible hose having a fixed end connected to the fixed cabin portion and a moveable end connected to the movable cabin portion. The flexible plumbing assembly also includes a sliding structure for facilitating movement of the movable end with respect to the fixed end as the extensible cabin portion moves between the extended and retracted positions. The flexible hose and the sliding structure are disposed in a floor of the extensible cabin portion.