Another thought; with two actuators it would be quite easy for them to get further & further out of sync if one of them ran just a bit slower than the other, leading to damage or lock-up. If you use an Arduino, you can use one limit switch to set a home position and a rotary encoder on each actuator to make sure they are in sync and get full proportional control, which seems like a good idea for braking.

I couldn't find the actuators on Google, do you have a link for them?