Not for the stock axle. See explanation below.
Casting - Initially when we were designing the JK truss, we wanted to bridge over the casting as all our other trusses do. But after alot of testing and discussion, bridging over the casting and not tying into it actually resulted in a weaker design because you have hug the casting (to avoid clearance issues) in a weird shaped truss that doesn't actually transfer load in the way it needs to. If you look at the axle, the pumpkin is the strongest part of the axle. The weak parts are right where the tube enters the casting and the tube itself. So essentially, a truss that only attaches to the tube, then makes a weird shaped bridge over the top that's not directly inline with the rest of the truss is in fact only keeping the tube from bending and not reinforcing the junction of the tube and casting. By welding to the casting and tube and having everything tied together, it reinforces everything directly and its attaching to the strongest section, the main casted section. It also means you keep the factory driver side UCA mount that is cast instead of having to cut off that very strong mount and replace it with an inferior bracket.
We've sold thousands of the JK trusses with great success. We run them on our JK with 40s. No need for a bridge that goes over on the stock axle. The ONE TON SWAP needs it because there is no cast in mount on the dana 60.