(I edited out the list of individual tools to make the post shorter.)

I've never bothered with spare hoses just because I've seen so many people patch a hose with duct tape or just cut the broken section out and hose clamp it back together (have hose clamps in there too). I do need to pack a spare belt though. I keep the 1/2" drive stuff in there because these tools not only get used to wrench on my Jeep, but anyone who breaks their rig and needs to borrow a tool. Some of my friends running 2 1/2 ton military axles and 53" tires need beefy tools to work on them.

I will be adding spare front axle shafts and a spare front drive shaft. I removed the rear bench seat and installed a racing bucket in the rear to give me a lot more room back there. I'm pretty good at organizing tools and use tool roll-ups and socket rails for everything to keep them where I can find them. The big crescent wrench is a 24" and it resides in a mechanic's tool bag along with anything else too big to fit in a tall 20MM ammo can.