Yes - both the Trailer Toad and the Safety Hitch are very cool devices!
The Safety Hitch is a BIG and beefy gooseneck or 5th wheel hauler - it weighs in the neighborhood of 1300 lbs, it has brakes, and it costs more than $10,000. But it allows an SUV or a pickup without much payload capacity to haul a gooseneck or 5er because the Safety Hitch carries the entire pin/tongue weight of the trailer. And, like in the picture below, if you have a pickup you can still use the bed and load the cab and bed up to your full payload capacity.
Well....one of the problems is GCWR - the combined weight of your tow vehicle and what you're towing. For instance, my truck has a GVWR of 7200, and GCWR of 15,500. If I load my truck up to its max weight of 7200, that would let me tow 8300 lbs.
However, if 1300 lbs is used up by the Safety Hitch, then I'd be limited to a 7000 lb trailer.
My older used Trailer Toad only weighs about 200 lbs, and cost me $2000:
So, with my Trailer Toad, I can still pull 8300 lbs, but if the Toad only uses up 200 of that, then I can hook up an 8100 lb trailer before I'm at my GCWR limit - 1000 lbs more than if I had the large Safety Hitch.
The Trailer Toad is a much lighter unit, has no brakes, and only can tow a trailer with a bumper hitch ball coupler.
The Safety Hitch looks like a great unit to haul a heavy gooseneck/5er, but you still need sufficient GCWR to be able to haul a heavy load.