[QUOTE=WalkInTheWoods;8637311]
I bought a brand new trailer at a horse expo. The trailer was not on-site, it was back at their dealership. A few days later i went to pick it up. They hooked it all for me on my existing 1 7/8 frame hitch and off i went. Hit a couple stop lights and accelerated a couple times and there was a big clunking noise each time. I knew something wasnt right so turned around and drove right back. Sure enough, the trailer was meant for a 2 inch ball. Professionals did this to me ![/QUOTE]
the ball is separate from the hitch receiver, so there is no “existing 1 7/8” frame hitch" the ball is replaceable. This story doesn’t make a lot of sense to me - unless you already had the ball and bar and it happened to be a 1 7/8 ball? there’s not a lot of visual difference between a 1 7/8 and 2 ball such that someone hooking up the trailer would immediately notice it’s too small. It’s entirely possible they presumed that you would show up with the correct equipment to tow the trailer you purchased. Playing devil’s advocate on that one I guess.
My trailer is a 2 5/16" ball. It’s a 2014 model, though. I haven’t seen a trailer that takes a 2" ball in a long time.
As for the original question, it is the operators responsibility to follow all state and federal laws while operating their vehicle, which includes the use of tow chains, working trailer lights, and working brakes if required for age/weight of trailer in your state. It doesn’t matter who hitched it, it’s the driver’s responsibility the second she got behind the wheel.
This wouldn’t have been hard to figure out, either. A 1 7/8" trailer ball is max rated for 2000lbs and a google search turns that up immediately. It doesn’t take a genius to determine that a two horse trailer with two horses in it is going to weigh more than that. Any basic research on the buyer’s part would have resolved this problem (and pointed out that trailer chains are required. Even if not properly configured, they likely would have kept the trailer from crossing traffic…)