I have to move to one side to take the weight off th centre of the bed board to allow the slider to close more easily on my Skyline bed, I use a bolster pillow to take up the extra depth to the slider so my pillows don’t keep sliding away from my head.
I also added some stainless pins to the end of the slider that engage with the front headlining surround to support the front edge of the slider while it’s closed and I’m up there.