What I really need is to find a wrecked GX550 and buy the rear side cargo panels so I can experiment. A 3D scanner and printer would help too. I can probably find someone local to whom I can sub that work, though.
There is also a ton of space under the cargo floor beyond the little plastic-lined cubbies that hold the jack tools and spare tire tools. I plan on ripping out that plastic floor and so you can access that lost space. Will have to make sure sufficient support remains so the carpeted cargo floor remains rigid - can also add a couple more in-floor anchors. You could easily stash a few gallons of water up there for emergencies - change it out every few months. I carried a gallon of water in one of my old Land Rover cubbies and I needed it once out in the desert. It was probably over 6 months old and tasted like hot crap but its water.
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I'll bet the majority of our recovery gear could be completely swallowed up in the empty space around the rear wheel wells. For recovery I have the winch controller (currently stored inside a beer bottle coozie in the front passenger door panel bottle holder), a recovery bag with a 20-foot synthetic winch line extension, an old and well used 30-foot recovery strap, a tree saver strap, snatch block, various 3/4" D shackles, and a small hatchet. I keep a nice and nearly new 30-foot recovery strap under the driver's seat, and under the cargo floor I have a first aid kit, TP, winter gloves & hat, baseball cap, bungee cords, ratchet straps, hitch receiver recovery point, D shackles, soft shackles, original jack & spare tire tools. It will be nice to be able to keep all the recovery gear together in the recovery bag that will be accessible at all times. I also have a headlamp, some small tools, and 3 pairs of gloves (heavy duty work gloves plus 2 pairs of thinner driving/tactical type gloves) jammed in the door pockets. The glove box has a big Mag Lite, spare mag, 50-box of .45 ammo, and the usual owner's manuals and insurance & registration documents. My center console with the fancy 3D printed cool box organizer has a Leatherman, Brunton compass, tire gauge, various charging cords, pens, markers, etc. The little side panel on the driver's side of the cargo bay has a folding shovel, ground tarp, giant rain fly for shelter, a water purifier tumbler cup, and a lantern. I keep an axe in the lower forward part of the cargo bay - this really needs to be secured. I've basically stuffed crap all over the place like a squirrel because the storage situation in the GX550 sucks.