RC if you can get someone who has a road roller with vibrator to pack your gravel driveway it will last alot longer, the guy who put in my 800ft. driveway through the woods had one and after 8 years of extreme temps. it's still in great shape.
He also put a special fabric down under the gravel.

http://www.globalsources.com/gsol/I/Road-roller/p/sm/1040639740.htm
http://www.usfabricsinc.com/geotextileapplications/drivewayfabricgeotextile