Oppose slides

Those are Schwintek slides on Winnies. They use a rail system that requires power to the small motors mounted at the top ends of both slides. Once you hit the button, you should not stop the movement part way or you risk them going out of synchronisation.

With this in mind, I would put out each slide individually because they need all the power they can get, especially on the way back in. You want to mitigate any opportunity for 'stalling' especially if your battery(s) is a bit low.

I have them on mine also and I put them out one at a time.