A dual-independent hybrid actuator system, comprising: an actuator body defining a hydraulic chamber within an interior of the actuator body, the actuator body further defining a first hydraulic fluid passage and a second hydraulic fluid passage in fluid communication with the hydraulic chamber; a hydraulic piston assembly, including: a hydraulic piston disposed within the hydraulic chamber and dividing the hydraulic chamber into a first hydraulic sub-chamber in fluid communication with the first hydraulic fluid passage and a second hydraulic sub-chamber in fluid communication with the second hydraulic fluid passage, and a piston rod mounted to the hydraulic piston and passing through the second hydraulic sub-chamber, the piston rod having a distal end that projects outward from the actuator body; an electric motor mounted to the actuator body, the electric motor having a motor shaft; and a threaded axle mechanically coupled to the motor shaft of the electric motor, the threaded axle passing through the first hydraulic sub-chamber and engaging with a threaded port formed in the hydraulic piston assembly; wherein the hydraulic piston assembly defines an interior chamber within a body of the hydraulic piston and/or the piston rod that accommodates a portion of the threaded axle that projects through the threaded port; characterised in that the body of the hydraulic piston and/or piston rod defines a fluid pathway between the interior chamber and the first hydraulic sub-chamber that is independent of the threaded port; and in that the hydraulic piston assembly further includes an in-line check valve located along the fluid pathway that provides greater resistance to hydraulic fluid flowing through the in-line check valve toward the interior chamber as compared to hydraulic fluid flowing through the in-line check valve from the interior chamber. an actuator body defining a hydraulic chamber within an interior of the actuator body, the actuator body further defining a first hydraulic fluid passage and a second hydraulic fluid passage in fluid communication with the hydraulic chamber; a hydraulic piston assembly, including: a hydraulic piston disposed within the hydraulic chamber and dividing the hydraulic chamber into a first hydraulic sub-chamber in fluid communication with the first hydraulic fluid passage and a second hydraulic sub-chamber in fluid communication with the second hydraulic fluid passage, and a piston rod mounted to the hydraulic piston and passing through the second hydraulic sub-chamber, the piston rod having a distal end that projects outward from the actuator body; a hydraulic piston disposed within the hydraulic chamber and dividing the hydraulic chamber into a first hydraulic sub-chamber in fluid communication with the first hydraulic fluid passage and a second hydraulic sub-chamber in fluid communication with the second hydraulic fluid passage, and a piston rod mounted to the hydraulic piston and passing through the second hydraulic sub-chamber, the piston rod having a distal end that projects outward from the actuator body; an electric motor mounted to the actuator body, the electric motor having a motor shaft; and a threaded axle mechanically coupled to the motor shaft of the electric motor, the threaded axle passing through the first hydraulic sub-chamber and engaging with a threaded port formed in the hydraulic piston assembly; wherein the hydraulic piston assembly defines an interior chamber within a body of the hydraulic piston and/or the piston rod that accommodates a portion of the threaded axle that projects through the threaded port; characterised in that the body of the hydraulic piston and/or piston rod defines a fluid pathway between the interior chamber and the first hydraulic sub-chamber that is independent of the threaded port; and in that the hydraulic piston assembly further includes an in-line check valve located along the fluid pathway that provides greater resistance to hydraulic fluid flowing through the in-line check valve toward the interior chamber as compared to hydraulic fluid flowing through the in-line check valve from the interior chamber.