I ride a fair amount on gravel roads because there are so many where I live and the country side is beautiful. About the only thing I can add to the discussion is the bit about gravel roads and consistency. There is none. On the same stretch of road you can traverse between big chunky gravel to smooth hard pack dirt. Of course add into the mix clay and it's a never ending fluid shifting terrain. Also add into the mix that road commissions regularly grade the roads so that one day you might take a ride on hard pack that is almost like a paved road except with the washboard effect and go down that same road a day later when the road has been graded and now you are surfing through big chunks but not dodging the potholes and washboard.

Have fun!

For sure, it keeps it interesting!