I understand it can be a considerable amount of money to tie up for "fancy name" tools; however, in a muddy field is NOT where you want your open end 9/16" wrench to blow apart.
I'm third generation Snap-On "fan boy" but in my experience, they fail the least. Note I did not say they "don't fail" because I've broken every brand of tool made (including the good European brands Facom etc.). Dad had all the tool companies coming to the shop: Snappy, Mac, Matco, Cornwell etc. Plenty of Craftsman (particularly larger sockets- 3/4" drive stuff) Tried them all, and keep coming back to Snap-On. They all fail. As noted above, the lifetime warranty on Craftsman was enticing, but going back several times in the same week to replace broken tools does not help productivity.
All that said, if you have a set (not brand) of tools that have performed well for you, those should go in your truck on expedition. I like to keep a pad on my tool box in the shop and note the exact tools I'm using during my build/restoration/outfitting so that every need will be covered. But, no sense carrying a set of Torx sockets to cover the ONE torx socket head fill plug on the R380...
So be smart about the pack, but never skimp on the quality. Once the adrenaline and rage are flowing, trying to get to the camp location as it's pushing 11:00PM, stuff can break that you just never anticipated.