The Class 2 + 3 Safety Chain from Buyers Products is rated up to 5,000 lb. The chain is zinc-plated to withstand corrosion. Available in a range of sizes and lengths, chains feature handy quick link connectors that close on a threaded link. Use two safety chains with a total holding capacity of at least the total weight of the trailer and its contents. The chains are designed for towing only, not for lifting.