Linda, We used a Reese sway control unit on our Casita. It, or one just like it, is available at Camping World for $60, and Camping World is never the least expensive place to buy. With the 21, we're using the Anderson for both sway and weight distribution. I know, that's a no-no and I do have mixed feelings about it. The 21 actually towed very well with nothing, but like I said, you don't know that you need sway control until it's too late. I'd like to hear from other Ridgeline owners on this subject??