If your drive train is good, battery and charging system is up to specs, tires are good then go. Stow 2 sets of filters, a decent set of hand tools and a rubber mat in case you have to mud dive. Take a gallon of zerex, a couple of quarts of diesel oil and a quart of trans fluid. (Zerex won't be available and I hate paying high prices for fluids when needed on the road.)

I usually also take my universal engine remover ($1,000 cash) and a credit card. Money can fix anything. Cash can get a better deal - even under duress. I don't worry about anything other than trans & engine because the ancillary parts can be had within a day.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.