You guys are great. Keep up the hard work and don't get discouraged along the way. Have tire pounding parties. I look forward to watching move in day in a couple of years.
I've seen a couple of videos where they use a tool that resembles a jackhammer with a blunt attachment to pound dirt into the tires instead of the sledgehammer, could be faster/less tiring. One of them even had it hanging in the air from a pole with, a rope that was fairly springy, it looked effortless. I found one of them, they used a pneumatic tamper. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-y8LwovQ4DCk.html