I just installed bilstein 2549, 2550 and Rancho RS5404 steering stabilizers on my truck. I have had bad luck on my 95 GMC Safari van with NAPA shocks. Our auto shop at work gets all their stuff at NAPA and they told me when I had trouble with the NAPA shocks that they quit using NAPA shocks. I used their sensi-tracs or something like that that were their top shocks. They just did not work very well. I get 30% off but would not get their shocks again, I live on 1/2 mile of dirt road and could easily tell they did not cut it. Never tried them on my truck.
Just my story. No problem with bilsteins yet. Been on for 2 weeeks. Go with Bilsteins or Rancho.
Those that tow like the adjustibility in the rear of the Rancho RS9000. You can change it for loaded or not. Might consider Bilsteins in front and RS9000's in rear if I were you. I only tow occasionaly so Bilstiens all around for me. Don't care to keep crawling under the truck.
Dave