World's Largest Truckstop located in Walcott, Iowa. Interstate 80 and Exit 284. Iowa 80 is a mecca for professional truck drivers, travelers and RVers. Iowa 80 completed yet another expansion in 2006. Iowa 80's new 30,000 sq. foot Super Truck Showroom features everything from chrome bumpers to lights to cleaning supplies. The new addition, boasts two full size tractors and a tractor-trailer inside the building.