We use a Burley trailer with our RW4. Any of their trailer options should be compatible, but not all of the hitch/mount options will work. This is the hitch design we have: https://amzn.to/3vMkyR8 . It's very quick to attach and detach and has no interferences with anything on the RW, including with the running boards installed! The way we have ours set up, we need to fold in the baskets that we have on the back part of our rack in order to attach and detach the trailer from the hitch, but once it is on, the baskets can be folded out and loaded up just fine. If you have panniers or side baskets you will probably have a similar experience.