Borderlands is a weekly rundown of developments in the world of United States-Mexico cross-border trucking and trade. This week: Mexico remained the top U.S. trade partner in July and Laredo was the No. 1 gateway; production and exports of Mexican-built trucks slipped in August; Maersk has teamed up with Fabric to open a Dallas e-commerce center; and a cargo checkpoint opens at a Texas border port of entry. Mexico remains top US trade partner in July, Laredo No. 1 gateway The partnership between Mexico and the United States continues to solidify with Mexico being the top U.S. trade partner in...