The trim system to me seems to be a potential single point failure. I am sure that I am not the first person to have this thought but I have search the forum and can't find this possibility disscussed.
I have recently been talking with a man who is finishing a series 5. He switched the trim system from horizontal stabilizer to making tabs on the elevator. His reason was the possibility of the actuator failing.

If it failed and just stoped in a certain position the plane would be hard to fly but still landable. The problem that I could see is if it fails doesn't freeze but instead just floated uncontrolably, or if it runs to an extreme positon. (I think we would all agree this would be bad)

Are there good ways to use the trim system while also making a backup or are these actuators just that good that they can be trusted in this fasion?
(by the way I have the kf SS)
Tyler