A cargo rollout stop includes a base having a first end and a second end. A first guide head is movably mounted to the base proximate to the first end, and a second guide head is movably mounted to the base proximate to the second end. The guide heads each are movable between a raised blocking position and a lowered non-blocking position. A blocking member is movably mounted to the base, and is disposed between the guide heads. The blocking member includes a first portion engaged with the first guide head, and a second portion engaged with the second guide head, and is movable between a first position and a second position. The first and second portions prevent substantial downward movement of the guide heads when the guide heads are in their raised blocking positions and the blocking member is in its first position. The guide heads are restrained in their lowered non-blocking positions by the blocking member when the blocking member is in its second position.