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I like my rancho 9500xl and they have a rebate on them right now. I like the adjustability. Haven't used it towing yet. But had pretty full load of dirt that I stiffened them up for, and road great.
I have both the bilstiens and the ranchos on my trucks, have been through a couple of sets of both of them as I wear out a truck in 5 or 6 years. The bilstiens may be a bit better, but I have had failures with those as well as the ranchos. The thing with the bilstiens are they will change the ride of your truck to a stiffer ride, and I think they wear the suspension and bushings a little quicker that way, jmho. If you get the ranchos they offer an adjustable series which may be better if you don't carry a lot of weight all the time and you may not care for the stiffer ride as the bilstiens are not adjustable.