You can clean all that stuff up while it’s off and paint it before you replace the joints. For light wheeling I’d do that, or go with Rough Junky. I have an RC long arm on my XJ, it’s ok but could be much better.
The thing about a long arm is it’s actually a radius arm, this results in terrible wheel hop, and steering bind when it droops due to the fact that the axle is rotating forward. The joints are constantly being stressed in opposite loads so they wear fast. Don’t get me wrong, it’s still a good upgrade from short arm, and they serve their purpose well. But if I had it to do over again I’d have went straight to a real 3 link in the front of mine.
Not to mention if I want to service my transmission I have to remove the arms and that cross member. CavFab or someone makes a cross member with a removable center section for this.
But for the value, and light wheeling and beach driving, you may be better of just going with a Rough Country Kit.