Saw these axles on eBay with air locking actuators on, anyone seen them before? What are they called? Seem a nice soloution for the expensive electric ones.
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/153208669782
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/153208669782