Between front seats I have a water proof (so-called) backpack that we put our goggles, gloves, ear muffs, clean rag, tissues, munchies, etc. Also you can put a bottle water in each side pouch.
For all my trail tools like air compressor, tire plugs, tow straps (3 30') and shackles, tarp, jumper cables, hatchet, saw, socket set, screw drivers, roll of steel wire, electrical tape, tie wraps, folding shovel, rain coats and pants and some stuff I am sure I forgot, I have water proof (so-called) big duffle between rear seats that fits perfect as a arm rest and leaves all of back still open behind seats for soft sided ice chest, 5 gallon race can, and etc.
Glove box has toilet paper, flashlight, headlamp, extra batteries, tire pressure gauge, leatherman, maps, compass (walk out at night if needed), extra 9mm HP ammo (maybe extra mag), lighter, sheath knife.
Fire Extinguisher on back seat bracket.
Oh... and I always carry Sig 9mm CCW Permit
Spare tire and tools to be added soon...