milk truck

Short definition from Wiktionary

Noun

1. 1
   Any of several types of truck used for road transportation of liquid fresh milk; usually, a tanker truck for bulk transport; formerly often a stakebody truck to pick up milk churns (milk cans); sometimes a truck to deliver milk bottles for home delivery.
2. 2
   unarmored or lightly protected truck-like vehicle, sensitive (fragile, exposed) to damage