Long drives do not create faults. They find the ones already there, usually at the least convenient point of the route.
Twenty minutes in the driveway
Tire pressures cold, including the spare, and set for a loaded car — the door-jamb sticker has a laden figure and it is not the one you normally use. Tread and sidewalls. Oil and coolant while the engine is cold. Washer fluid topped up properly, not with water. Every exterior light, with somebody standing behind the car. Wipers, which you will notice at the first rain and not before.
And the paperwork
Roadside assistance that has not lapsed, insurance that covers where you are driving, and the service history to hand if the car is due for something mid-trip. Check whether the service falls inside the trip's mileage — it is much easier to bring a service forward two weeks than to find a shop on a holiday weekend four hundred miles from home.
The check is cheap. The alternative is a shoulder and a phone call.