Never had an issue with tek screws in any of my vehicles, if your concerned about them vibrating out put a little bit of RTV on them. Cheers
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There are 2x M8 holes for the fold down seats, you can secure a pair of drawers to these.
For the other drawer track I bought a couple of square galvanised steel washers from Bunnings to glue to the underside of the tray for bolts to clamp, but haven't seriously looked how to do this yet..