Business inventories rose 0.8% in April, the Commerce Department said Tuesday.
The increase followed a revised 1.3% increase in March that was more than originally reported.
Sales rose 0.1%, 0.1%, the smallest since June of last year.
Inventories were projected to increase 0.9% increase, Bloomberg reported.
Factory inventories, which make up about two-fifths of the total, rose 1.3%, while wholesale inventories, which make up about 30%, also gained 0.8%.
When sales are growing, it usually means trucking is seeing additional demand to deliver goods and restock shelves.