I'd recommend if you are going to go through the work of buying and spreading all that rock, to go ahead and scrape off your topsoil first. Not sure how thick the topsoil is around Dallas area, but around these parts it's 8 inches or so...if you take that off and replace with a layer of 2-4 inch rock as a base, then come back with a CA-6/road pack layer in my experience your road will be a LOT more stable a lot sooner.

And at least here topsoil is a decent commodity. You might be able to find someone who would scrape it off for free if they can have the leavings.

Dale

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"When tempted to fight fire with fire, remember that the Fire Department usually uses water." - anonymous