My longest trip was 2,950 miles coast to coast across the US, I've done that 5 times, I've done both US Coasts multiple times, and a million other trips in the 250+ zone. I love a road trip, I love seeing cool new things, and I don't mind driving.
Tom Clancy was my go-to years ago for spies, military, and good suspense. John Grisham is another reliable option for justice and legal thrillers. Both usually had the good guys winning in the end.