The world’s largest truck stop is getting larger. An expansion of the truck museum at Iowa 80 Truckstop in Walcott, Iowa, has begun, the Iowa 80 Group recently announced. This project includes a 25,000-square-foot expansion of the exhibit hall, where historic trucks and other trucking memorabilia will be housed. Following the completion of this addition, Iowa 80 will feature 121,000 square feet of exhibit space. The Iowa 80 Group said the constr…