Like OldeSmoker states, you can use bars to hand sausage. You can purchase them, or make your own, which is what I plan to do at some point, just haven’t. Thought about using rebar and welding feet to each side to keep the bar in the track.
That said, I’ve smoked a good amount of sausage on the racks and they turn out great! I have a #3D as well, so same size. You will love this smoker. They are great for so many uses.