For truck with trailer or special vehicle for mining operations, the standard usage life is 8 years.

带拖挂的载货汽车、矿山作业专用车使用8年。

youdao

The back of a truck with a rusted trailer hitch and broken tail light can be seen in the photo.

CNN: STORY HIGHLIGHTS

The multi-part accident involved two school buses, a GMC pick-up truck and a truck-tractor with no trailer.

FORBES: NTSB To States: Ban All Driver Use Of Mobile Phones

Each serves about 120 stores, and most of them have assigned a shipping dock to every store, with a truck-trailer parked waiting to fill up for a run.

FORBES: Merchant Princes