1. Rethink the RC long arm kit if you wheel your rig.
- Poor ground clearance (low hanging CA brackets)
- Exposed tranny mount nuts (poor design)
- Drops drivetrain 1" (no point for this if you have an SYE)
2. Weld the insides of the axleside stock LCA brackets and weld a piece of 3/16" to the front of it as a skid/gusset to tie the sides together.
3. Reinforce the pass side UCA mount by plating the front of it, thereby tying the two sides together. They have a tendency to fold/rip off when subjected to the binding of a radius arm kit.
4. If you plan to wheel hard, and move up in tire size (looks like you're on 33s?) then definitely start looking into plating the unibody. I'd buy the whole set of HD Offroad stiffeners (front to back) and consider plating the floor where the front/rear leaf spring mounts are with 1/8 - 3/16". Whoever you purchase your long arm kit from, make sure you tell them you've done this.
5. You should be covering your gas tank, t-case, and have rocker protection at this point. Stock is ok for grazing over rocks, but any hard hits require more beef to be able to last.
6. Have you addressed your steering? With increased flex comes increased stress on the steering components. Please don't tell me you have stock steering and it's "working fine".
Again, this all assumes you wheel at all. I don't know if you just want a better ride on the street or not, at which point I would tell you to just get drop brackets and be done with it.