Retail sales fell 1.2% in May, the biggest decline since September, the Commerce Department said Friday.
The decline followed a 0.6% gain in April that was bigger than originally reported.
Economists had forecast May sales would rise 0.2%, Bloomberg reported. Five of 13 categories declined, led by a 9.3% decline at building-materials stores.
Almost all trucking operations depend on the health of retail sales because such sales involve nearly every type of cargo.