We are doing 107 miles of a 250 mile trip this summer on gravel.

Hopefully it's all hard packed as I'm only running 700x30s.

I really see no point in going super wide if you are on pavement 100% of the time, but soft, fresh or wet gravel can change everything rather quickly.

Then I went a nice wide, plush tire.

Something I can drop the air pressure on and float over rocks, sand, muck etc.