I probably go overboard, but when I did my 90k mile timing belt four years ago, I replaced everything on the front of my V8....timing belt and tensioner, waterpump, all the serpentine idlers, belt, and tensioner, thermostat, upper & lower radiator hoses, and new plugs. We had just bought the truck 7k miles prior, and I drive over the road for a living....can't have wife stranded roadside somewhere!
If you plan on a long road trip (10k miles is a long damn trip by any standards!), I would want piece of mind. Cost isn't much if you do your own labor. Diff fluids have been a hot topic lately, I would do those too and maybe reap .10 or .20 mpg increase in fuel efficiency while I was at it!
....just my opinion though, the real overlanders might have more applicable advice.
Safe travels though at any rate!