[jQuery] $.ajax - truncates data

[pp...@fragrance-world.net]

    $.ajax({
            type: "POST",
            url: "/_webservices/shoppingcart.asmx/AddItemToCart",
            dataType: "xml",
            data: "cartdata=" + $("#cartXml").val() + "&sku=" + sku,
            processData: false,
            success: function (xml) {
                $("#cartXml").val($(xml)[0].xml);

                var cartNode = $(xml).find("carttotals");

                $(".totaldata:first").text(cartNode.find("items").text
());
                $(".totaldata:last").text(cartNode.find("totals").text
());
            }
          });

I am calling this code with success, but when cartdata (paramater) get
large, then it seems to truncates getting into web service?  Anyone
have any ideas what it could be?

Thanks
Pardeep