After a 10 year old girl was killed about 15 miles from here a couple of weeks ago by a horse trailer becoming detached from the tow pickup and hitting the car she was in head on, I completely redid the chains on my 18' flatbet.
My pickup has a Cat 3 receiver bolted to the frame with the receiver directly under the bumper. The bumper is rated at 10,000 pounds, and there are 1" holes existing in the bumper but too far in to hook a chain hook into.
What I did was get a couple of clevises, each rated at 6500 pounds, put them through the holes in the bumper and bolted the chains to the trailer tongue with grade 8 bolts. The chains are cut the right length to cross over, and hook to the clevises with latched hooks. Every part of each chain is rated at at least 5,000 pounds.
With the trailer licensed for 5 ton, and the trailer itself weighing 1 ton empty, I doubt I'll haul anything on it that exceeds the capacity of the safety chains.
If anything good could come from the little girl's death, I'd venture a guess that virtually 100% of the trailer safety chains in the news coverage area were given the eagle eye and probably half of them redone. It was a wake up call for anyone who tows a trailer.