I've been hauling a tractor to some other property 100 miles away (no more, I'm putting a storage box up there!) It's 25 miles to the nearest auto parts store.
I never could out guess the crazy things that would happen. I am doing land clearing and everything else, so the tractor is vulnerable to attack from a lot of different directions. When the hoses started looking bad I measured them and had a new set built.
Nice big light colored good tarp for putting on the ground so you can find the nuts and bolts you drop!
Come-along, tow strap, a MAJOR first aid kit. Extra hydraulic fluid and diesel in case you really screw up and drain it to the point of not being able to get it back to the trailer. One of those tanks you can put pressurized air into. You probably can't fix a flat unless you're good with one of those plug kits but a couple times I managed to get the tire wrenched around enough that the bead let the air out. Every possible tool you can carry if you're going to be out in the wilderness. Fan belt, rad hoses, antifreeze, boy I could go on for ever. If you are going to a particular place try to make friends with a neighbor, do some odd jobs for them with the tractor. When you get your truck stuck trying to pull your tractor out, or you need that flexible 29mm socket and you forgot your 3/4 to 1/2 adaptor, a good friend will be a god send.
And if I might diverse a second (do I ever talk for just a second?) on the hydraulic hoses...
When I first got my tractor I had to order a hose from Ford NH. It was a zillion dollars and took a week. My neighbor who works on equipment for a living slapped me around pretty good, and told me next time to go to a hose outfit, in my case Timco in Tacoma Washington.
The hose that was about $35 from Ford...? When I took a longer one in he asked if I wanted to use the old fittings or get new ones. I asked what the difference would be. The cost of a new hose with my old fittings was about $4, with new fittings was $6! Those guys have been wonderful. I do have to swallow my pride though, seems like everytime I go in they look at my stuff and giggle and say "What's THAT for?" Most of their work I think is big 2" hoses, 3-4 who knows how many layers for god knows how many PSI. My little dinky ones...I usually say it's for the HYDRAULIC SEAT on my TRACK HOE down at the Centralia Coal Mine.