Feeder systems for rock, sand, dirt and gravel. Contact Rock Systems for loading hoppers, vibrating feeders, truck unloaders, dozer traps, bins and more. ... Inventory available for sale, rent, or lease. 50 Ton Truck/Scraper Drive-Over Unloader. Inventory Number: 104-50 ... Model 102-A Dozer Trap with Belt Feeder. Inventory Number: 102-A. View ...Web