I am in an area that contains a lot of rocks. Half the time I rent a big ride on trencher and half a walk behind. Sometimes the walk behind will wear you out trying to dig in the ground. I need something that will handle the work load and work in big/small/rocky conditions. I am wanting a reasonable priced machine and would like to spend no more than $10-$15K on a machine. If it really worked I may go more $. Any ideas on what you all have had good results with would be appreciated.