heavy-load russian

• большегру́зный

  heavy, heavy-load

• тяжелове́сный

  heavy, heavily-laden, heavily-loaded, ponderous, unwieldy, clumsy

• ломово́й

  designed for the transportation of heavy loads

  (noun) ломовой извозчик

  (adj) crowbar

  (colloquial) very difficult (about work)