Tool storage ideas

[Corb71K5]

Looking for any ideas for tool/spare parts storage in my 90 K5 blazer. Looking for something that can fit behind seat and keep them secure in event of accident. Currently theyre in milk crates strapped down but gotta be a better way. Some of the things I like to carry are spare axle shafts front (D60) inner and outer, hubs, u-joints (1350) rear axle shafts (9.5" 14bolt). Impacts, 1/4", 3/8", 1/2", drill, cordless ratchets, grinder and various wheels, spare bolts and washers, wiring kit, fuel pump, fuel line, air comppressor, tire repair kit. Recovery gear, winch extension, snatch block, 2 20' straps 1 30' strap. Clevis's soft shackles, tools from 1/4"-1/2" drive sockets, wrenches to 1 1/2" screw drivers, pry bars and hammers. Im a field mechanic by trade and have separation issues from my tools