oh ya, it's very rigid. And I got all my clearance back underneath which is nice when I'm rock crawling. The only thing I would change is possibly cut the old mounts off, and put them there but my bars weren't long enough for that. And I'm very much a novice welder so I kept it as simple as possible.
They might be a little extra white trash because they are dumbbell bars that I cut at appropriate angles but they are solid and have worked much better than the thin tubes that came with the lift, also I never smash them on rocks like the over ones.
I cut some short solid 1" bars and welded them next to where the support tubes mounted to the rear bracket and to the bottom of the frame right where it starts to angle up. Let me know if you want a picture. Most people are very against welding stuff to the frame and what not but I'm hoping to eventually do a SAS so what's one more piece to cut off?
I don't know if it is the only one or not but I only had to drill holes to mount the support tubes that run from the drop bracket to the frame, which I bent and ended up welding in my own supports later.
I chose the Pro Comp lift because it was one of the cheaper ones for 4wd. I don't think you'll have any issues, but I don't know anything about RCX DB You can always call Greg at PRGproducts, he's like the yoda of nissan parts compatibility
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