I have my roadside kits complete.
Home Depot Rigid 30 dollar containers with inside top removed fits perfectly under rear lower stowage.
https://www.homedepot.com/p/205440492
In one I have towels, three Ryobi 4 Amp Hour batteries, 12v charger, air inflator, and shop light.
In the other I have everything else needed. Slime, flares, tools, flashlights, gloves, jumpers, medical, tire gauge, knee pads, towels, garbage bag, and more!
Between both Rigid cases I have scissor jack, pads, torque and lug tools.
Moving that is large blanket goes across on top nicely and still closes.