8mm
10mm (most common one you will use)
12mm
14mm
14mm spark plug socket
17mm
19mm
30mm (axle nut size)
8,10,12,14,17, and 19 ...Basically the same sizes as the sockets
Adjustable crescent is helpful too
5mm Allen is the most common size, but just bring a set
Needle nose pliers
Side cuts
4 in 1 screwdriver, or a set
Hammer
Cable tie assortment
Duct tape
Tire plug kit
Sidewall slugs
Glue tread kit
12v air compressor
Tree straps, clevis, snatch block for your winch
Gloves
Ran into this recently, AllthingzUTV makes a tool to pop axles out of diffs. If you ride in groups, might be worth having one to share around. Axle Magic 2