That's about 8100 pounds of bare F350 truck then add in the people, dogs and whatever else was in it and you are probably close to 9000 pounds. If it was a long bed, it would start at just under 8400 pounds (mine is 8360 CAT scale pounds, empty). I would say those safety chains along with the trailer frame did more then their job. A change of at least underwear would be handy if that was me.
Dave W along with my DW, Susan and our poodlepups, Callie & Molly,2011
Ford F250 6.7 CCLB, 5er Hitch Option w/B&W Hitch,,Ride Rite air bags, 2014
Montana High Country 343RL (38')w/disc brakes