That would be a long list, i guess it depends on were your going.Out here we bring everything
When i'm not on the trail i keep a complete socket set with a small amount of open end wrench but when going on the trail
The back area is full I have two Lg Tool Bags one is electrical and the other for hand tool & a small Fishing Tackle Box with var. nuts bolts and washers.
Standard open end wrenches to 1 1/2"
Metric up to 24
Air Gun and air ratchet with full set of sockets , Cordless drills & bits
3 vice grips ,big hammer, Pry bars ,screw drivers ,everything and anything that can fit in the tool bag
Gear Oil,Engine Oil,Power Steering Fluid, Water, Spare Rad Hoses , Fan Belts, Axles,Rear Drive Shaft,Hoses Clamps ,Spark Plugs & Wires.
Hack saw,zip ties , Tape ,WD40 ,Cardboard or blanket to lay down on keeps the ants off you.
I have one of those lg. Home Depot tubs that i fill up.
If the box has room i find something else to put in it, your bringing it anyways,
For example the last run we did i ripped the hydro ram off the mount had to remove it and lost a lot of power steering fluid good thing i had lots with me.
Carlos snapped an axle good thing he had a spare and all 4 of us had a boat load of tools and 3 High Lift Jacks to fix it but we forgot to bring some bearing grease so we had to save the old stuff. you can bet that won't happen again.
Extra food you never know how long your going to be out there after someone breaks down.
Better safe than sorry and if someone else breaks down and they forgot to bring something and you can help out, You'll be the hero and you can bet he'll be buying you a beer in the near future
So if you got it bring it.