LOS ANGELES (Reuters) -Container shipping rates continued their climb this week, fueled by the temporary tariff pause between the U.S. and China, but there are signs that demand underpinning the surge is moderating, financial analysts and maritime consultants said. Hulking container vessels operated by companies like MSC and Maersk ferry toys and apparel to Walmart stores and parts to factories run by major manufacturers such as Ford Motor Co. Off-contract spot rates for moving container cargo are seen as a gauge of economic conditions. The index was up 70% in the last four weeks, spurred by the May 12 U.S.-China trade truce that cut China tariffs to 30% from the 145% rate that collapsed trade between the world's two largest economies.