Hydraulic slide actuators (like any hydraulic ram) will move if there is a leak in the actuator, within the ram or in the system. Essentially, the pressure bleeds down and allows the piston within the ram to change position.
On early electric slides, locks (jacks or sticks) were required to hold the slide in place during towing to keep them from moving out. Later (current) design does not require locks and will not extend accidentally (as long as the slide mechanism is not broken). There is no requirement that I know of to maintain electrical power on the slide mechanism to keep it "locked in position". Slides won't move, by design, unless power is applied to the motor to cause the movement.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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