I have a house on a lake in east Texas and the dirt driveway is washed out (i.e. 2 foot deep rut going down one side of it, etc...). I want to fill in the ruts, get it level, and put gravel on top of it. What's the best material to use for this? Should I fill it in with regular fill dirt, or would red clay be better? What's the best gravel to go on top?