As long as you're sensible with your speed on the surface then any car can do any surface. Gravel roads unless badly rutted will do next to diddly squat to most modern road cars unless exposed to those types of bad roads for hundreds upon hundreds of kms at unreasonable speeds so I wouldn't stress about it... especially if you were to see what manufacturers put their cars through these days to actually break them when they do their endurance development and testing.