I'm not sure if Bailey's fitted ALKO stabilisers to the Ranger, however if it has got one on it then this is the information from ALKO regarding the type of towball to be used
"As you will be aware, AL-KO supplies (as standard), an extended neck bolt-on towball with every boxed AKS Stabiliser Kit. This towball MUST replace any existing bolt-on type ball to allow for the correct stabiliser clearances during operation. The following diagrams show the importance of using this towball and shows the clearances required to ensure correct operation. Failure to use this towball may result in product damage and WILL invalidate any stabiliser warranty.
When caravans are supplied direct from the Manufacturer, with an AKS stabiliser fitted as standard, it is essential to ensure that the customer is using the correct towball. If a swan-neck type of towbar is fitted, then providing the correct clearances can be achieved, the AKS can be used with this type of configuration. If the customer has a bolt-on type towball, they must be informed of the need to replace their existing towball, with the special AL-KO extended neck ball (Type A50-X). It is also important to inform the customer that any surface coating on the ball (ie. plating or paint), MUST be removed using emery paper (100-200 grade), otherwise contamination of the friction pads will occur."