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<tfoot>
  <tr>
    <th></th>
    <th></th>
    <th>Total euros</th>
    <th>Total kg</th>
  </tr>
  <tr>
    <th></th> <!-- NO pintaria nada-->
    <th></th> <!-- NO pintaria nada-->
    <th></th> <!-- pintaria aquí el total de euros-->
    <th></th> <!-- pintaria aquí el total de kg-->
  </tr>
</tfoot>

"fnFooterCallback": function ( nRow, aaData, iStart, iEnd, aiDisplay ) {
            var total = [];
            if(aaData.length>0){
                for ( var i=0 ; i<aaData.length ; i++ ){
                    for ( var j=1 ; j<aaData[i].length; j++ ){
                        if(aaData[i][j]!="undefined" && aaData[i][j]!=null){
                            total[j] = (parseFloat(total[j]) || 0) + parseFloat(aaData[i][j]);
                        }
                    }
                }
                for ( var j=1; j<aaData[0].length; j++ ){
                    if($("tfoot tr:eq(0) th:eq("+(j-1)+")",packing_lineasTable).text()!=""){
                        $("tfoot tr:eq(1) th:eq("+(j-1)+")",packing_lineasTable).html("<strong>"+total[j]+"</strong>");
                    }
                }
            }
        },