How Should Early Farm Tractors Be Designed?

Three wheel tractor
A Three Wheel Tractor: The Gray tractor was built in Minneapolis in 1915. Drive wheel is a large drum five feet in diameter. 20-35 HP. Waukesha 4-cylinder motor. Weight, 8,000 pounds. Price, $2,150 (which translates to roughly $43,500 in today's money).