Foldable extension for bedframe

[Gatosec]

Hello there!

I almost finished my bed in my car (french backpacker, sorry for my english) but there is still the foldable extension that annoys me. I tried to fix some sliders to sustain this but it isn't solid. I have a hole where I can put a M6 bolt to fix something where my finger.m is Any idea without losing too much space?

Thanks,

Nicolas