I agree. These cars are actually quite reliable and 120K is not really high mileage.

A thorough inspection before your trip is better than buying spares that you may never need.

Check the belt. If it is tight and not cracked it's okay to use until you start seeing cracks on the back ribbed side.

Check all the coolant hoses for soft spots or signs of deterioration that could result in a failed hose.

Check for any kind of fluid leaks. Coolant and brake fluid leaks should be attended to immediately. Engine oil, transmission oil, and P/S fluid if minor should be noted and bring spare fluids as dictated. Check and top off frequently.

Do a general safety inspection including brake pad thickness and replace them if they won't make it to the end of the trip.

Use the 15/30/60K mile maintenance checks as a guideline.

My bet is if you attend to any items that obviously need attention now, you will not suffer any breakdowns.

Duke