I agree with Austin.
I also had a couple of sets of Ranchos on my last vehicle, 2000 silverado, I had the RS9000s and RS9000XLs but in the end I went with 5100s and they rode better. I also had the in-cab remote ride adjustment setup with the Ranchos, that was really nice for transitioning from street to dirt but the 5100s still performed better.
I will say that I've had great experiences with customer service from both companies. Rancho gladly shipped me two replacement shocks (newer models at that), after I overextended the ones I'd purchased, and told me to just trash the old ones rather than go to the trouble of sending em back.
I also had the 5100s on my 4Runner for a time and they rode very well, but that was with FJ coil springs not the factory ones.