According to Agco, its 60,000-pound Challenger MT975B is the world's largest four-wheel-drive, articulated ag tractor. It is powered by a Caterpillar C18 ACERT diesel engine that produces 570 gross horsepower. It features a Cat Powershift 16F/4R transmission and has a maximum travel speed of 24.6 mph. An accessory package includes a scraper plate with hydraulic couplings and belly guards for contractors who want to pull scraper pans. Estimated list price: $250,000–$330,000.