A fifth wheel assembly safety coupling arrangement includes a fifth wheel hitch including a top support surface and a recess configured to receive a kingpin member therein, a locking arrangement moveable between a locked position, wherein the kingpin is prevented from being removed from within the recess by the locking arrangement, and an unlocked position, wherein the kingpin is not prevented from being removed from within the recess by the locking arrangement, and a pneumatic cylinder assembly configured to receive a first pneumatic input from a first air supply exerting a first force on the pneumatic cylinder assembly, and a second pneumatic input from a second air supply exerting a second force on the pneumatic cylinder assembly, wherein the pneumatic cylinder assembly prevents the locking arrangement from moving from the locked position to the unlocked position when the sum of the biasing force and the first force is greater than the second force.