?otoolling 4 pcs 5/16" x 12" trailer safety chain extension grade 30 7600 lbs galvanized steel safety chain kit with snap hooks for trailers rv campers 5/16" x 12" 4 is up for auction in Automotive. The current bid is $2.00, 95% below the $43.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.