You say it is all original and the hoses look good. Looks can be decieving.
Do you know how old the hoses are. They should be changed every 5 years in my book.
I would not want to take a trip and blow an old hose because they looked good. If in doubt change em. Look at the freeze plugs to see if they need changing. Change the hoses. Reverse flush the engine . Have the rad recored, put on new heater hoses and bypass hose if it has one.
While your at it put on some new belts .
Now you have a starting point .
So far you haven't spent a lot of money and probably will make the trip ok.
How old are the tires? Don't run on tires that are old or showing signs of cracking. 5 years should be changed and 10 years difinitly.
Happy travels. Bob