An anti-rollout assembly may comprise: a housing defining a cavity; a guide/restraint head pivotably coupled to the housing at a first end of the cavity; an overridable trigger pivotably coupled to the housing at a second end of the cavity, the second end opposite the first end; and a locking system operably coupled to the guide/restraint head and the overridable trigger, the locking system configured to bias the guide/restraint head into an upright position, the locking system configured to retract the guide/restraint head into the cavity in response to a first lateral force driving the overridable trigger. The locking system may comprise a drive link and a locking link and be configured to lock the guide/restraint head in a raised state.