I worked near Fresno California about 12 years ago where walnut groves are very plentiful. When an orchard gets to a certain age it has to go. Many farmers would advertise free wood. You had to have somewhat of a reputation for completing a job before you could get started. What we did was climb the tree about 20 to 30' up and set snatch blocks on several main limbs then run steel cable to my winch which was chained to several trees. The best time for this was not during the summer but when the ground was moist. Start up the winch and run until the whole tree was completely out of the ground. Then we cut all the limbs down to about 14'' to 16'' which I got for firewood. The guy I worked with trimmed all the roots and loaded up the base in a dump truck and hauled it to his yard where he immediately waxed them and put them up for sale. He had several years where he cleared several hundred thousands of dollars with the bases. I remember several really nice bases that sold for $5,000 each. He also had a small mill where he cut them up for gun stocks and made even more $$. In my best years I sold more that $50,000 in firewood. As usual I was in the wrong business at the wrong time. Thanks
Guessing those were mostly Claro ( English) walnut? Tend to be a little more in demand for high end gunstocks