ArmorTech does indeed make a bolt on application, but I'm not sure it leaves the factory hitch in place. Thought it did, not so sure.
Honestly, after seeing the way my high-clearance ATO is built from the inside, I have absolutely NO qualms about using it to tow the Tacoma's rated capacity. It lines the receiver up better with the mounting points, and there's less leverage between the receiver and mount due to it. And Kevin has a strong commitment to quality materials...no cheap-grade shit there.