I bet the electric actuators car companies are using are lead screw so they are self locking. That way without power it holds. I've used the link below model at work on a few projects. One in the link will put out 400 pounds of force at almost an inch per second in theory. Real world date gave...
I don't think it much matters. I cut the front off of my tunnel because my harness isn't shaped quite right and I couldn't get it the whole way forward.
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