{
  "truck": "Trailer-40ft",
  "capacity": {
    "weight": 10000,
    "volume": 60
  },
  "packages": [
    {"id": "A1", "type": "A", "weight": 200, "volume": 1},
    {"id": "A2", "type": "A", "weight": 250, "volume": 1.2},
    {"id": "A3", "type": "A", "weight": 180, "volume": 1},
    {"id": "B1", "type": "B", "weight": 500, "volume": 2},
    {"id": "B2", "type": "B", "weight": 550, "volume": 2.2},
    {"id": "B3", "type": "B", "weight": 600, "volume": 2.5},
    {"id": "C1", "type": "C", "weight": 800, "volume": 3},
    {"id": "C2", "type": "C", "weight": 750, "volume": 3},
    {"id": "C3", "type": "C", "weight": 780, "volume": 3.2},
    {"id": "D1", "type": "D", "weight": 1200, "volume": 4},
    {"id": "D2", "type": "D", "weight": 1100, "volume": 3.8}
  ],
  "constraints": {
    "front_axle_limit": 3000,
    "rear_axle_limit": 4000,
    "side_balance": true
  }
}