*Disclaimer*
The picture shown above is not my GX, it is simply a setup similar to what I am considering should I forgo the Goose Gear drawers.
Great minds think alike as I have four (4) Pelican 1650's for such use. They were originally used in combo for my scuba and photography gear but for the past few years they have been used on the roof for camping/overland travel, mostly when we still had the 4Runner. I have two setup with lid organizer sleeves that have zippered compartments and pockets and I just ordered Pelican EZ Molle panels for the other two. I'd like to get TrekPak divider kits for at least a couple of them but they are very pricey for what they are ($215 each

). I like using these on the roof because of their waterproof and rustproof ratings and the handles, latches, wheels and lock ability all add to their appeal. I have always had very good luck with their durability with the rifle cases but even when wheels and latches failed they gladly send replacements free of charge. Their CS is top notch and keeps me as a loyal customer even thought there are some very good alternatives out there these days and most for less money.
I could put four of these stacked one on top of the other and side by side in the cargo area with ease and they'd still sit lower than the top of the second row seats. That said, I would certainly have to remove them in order to sleep inside, this would ultimately put them back on the roof at least at night when camping. If I were to run a fridge on one side I could likely stack three on top of each other on the other side but I'll have to check clearances with the Kaon roof shelf before I can confirm that capability. Now to decide if having the utility of the built in drawers is worth the $1500 investment over a few pieces of L-track and some straps which would provide endless customization and the ability to return the cargo area back to normal at a moments notice. I have to say that I am leaning this direction and for more reasons than just the financial outlay.