My mom hauls their two horse all the time with her 15 passenger van. It has a 3500 engine though, she gets some weird looks though.

I don't know what the specific term is, I have a gooseneck so haven't any experience with it. He called them sway bars and described them as two poles that come in almost at a triabgle shape and support the hitch. I posted some pictures that looked like what he was describing.