Towing with a GN?
It seems you have two questions. Do they make a bolt on class 3 hitch? No, it will probably have to be custom fitted. The other questions seems to be: what damage is gonna happen? Since you already know it will physically pull the trailer down the highway, and you are right, but you maybe should consider what kind of problems you are going to have. If you are just going to move the trailer a couple miles and you live in Kansas, it might be awhile until anything gives, if ever. But if you live in Colorado, a couple of miles could be all mountains. It won't be long until your changing your shorts, or trans, or brakes, or headers.... Too many accidents happen because people push their tow vehicle beyond it's limits. And the problem is, the disaster doesn't happen right away, it takes miles of abuse until it happens and than it seems to come as a "surprise, I can't believe that happened!!"