I agree. I would never trust a system that loads the trailer latch. They were never designed for this. Under normal use, with a downward force on the ball, the safety latch isn't even really used. It only comes into play when the tongue is off-loaded (like speed bumps, or really hard braking from the TV).
Stock trailers don't even use latches because of the rough terrain they travel. Instead, they usually use a side-clamping latch.
Commercial couplers on full trailers and converter dollies, and even dump trailers, all use pintle hitches for the same reason. hitch weights are very light, and a standard latch would not hold up to high loads present in some conditions. I even used a pintle hitch setup for flat-towing a school bus, for the same reason.