"back load" meaning in English

{
  "forms": [
    {
      "form": "back loads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back load (plural back loads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "backload"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1944 November and December, T. F. Cameron, “Motor and Cartage Working”, in Railway Magazine, page 338:",
          "text": "Goods motors for which \"A\" licences are held are free to operate anywhere, to pick up the most remunerative traffic, and the points between which the best back loads are available.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of backload."
      ],
      "id": "en-back_load-en-noun-DZEwITrV",
      "links": [
        [
          "backload",
          "backload#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "back load"
}

{
  "forms": [
    {
      "form": "back loads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "back load (plural back loads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "backload"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1944 November and December, T. F. Cameron, “Motor and Cartage Working”, in Railway Magazine, page 338:",
          "text": "Goods motors for which \"A\" licences are held are free to operate anywhere, to pick up the most remunerative traffic, and the points between which the best back loads are available.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of backload."
      ],
      "links": [
        [
          "backload",
          "backload#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "back load"
}