Driving Across Country, Should I be Worried?

I have driven this vehicle from CT to TX and back, I am about to do it again. I

am not the original owner, I am the third owner and I have had it since 2015.

I keep up with all oil changes and have had the brakes done, new tires and

all belts and fluids checked ( radiator hose was replaced) No serious

problems with the car as far as I can tell. The electrical system has been

crazy since I got the car I have been able to hear a hum, and sometimes the

fan comes on when I am idling even though the car display and feel the

hood reveal the car is not overheating. What if anything should I be worried

about breaking down? It will mostly all be highway driving.