Toyota Tacoma Truck bed Build

Hey guys,Im not sure if I'm posting in the right thread or if anybody can help me on this idea.Im trying to build a Storage bed setup for my tacoma to sleep in when camping.I get the concept for the wood but I'm confused on how the tracks roll out on the bottom if you have pull out Jhores on the bottom.

https://youtu.be/nPe3AV7G19k Here Is the video I've been watching he talks about the Tracks at about 5:15 not sure what he is talking about.Thank you

I have a 2008 toyota tacoma 2 door

 

I can't watch the video at work, but this thread has a lot of good info in it:
https://www.tacomaworld.com/threads...eping-platform-drawer-storage-systems.424709/