The two major brands are Blue Ox and Roadmaster. I'd imagine Roadmaster provides good service also, but we seem to hear more about Blue Ox.
A little lesser know, there's DEMCO. All of those brands also offer a line of Base Plates. That Base Plate is what provides a solid tow bar attachment on your towed car.
Another company, Night Shift Auto, makes the Ready Brute Tow Bar. It's unique because it offers an internal braking device for your towed car.
So... Look at all the Tow Bar product lines. You may like one better than another for a variety of reasons.
Then look at Base Plates, IN DETAIL!!! Bore down into the installation instructions. They will show you two important things. One is how difficult and invasive the installation is for your specific vehicle. Second, you'll see a picture of a completed installation. That may give you an idea how level the tow bar will be without having to install a "Drop" adapter on your coach. This is since the Car end should be Plus or Minus about 3-inches from the mounting of the Tow Bar on your Coach.
Then, look and see if or how your favored Tow Bar will connect to your favored Base Plate. I think you'll find that most if not all of the above brands offer ways to connect to each other's products.