87chevy wrote:...I think they will go good with a set of z71 springs.
Shocks are a combination of length and valving. The BDS were the only set chosen by the designers for us KNOWING they were going to be used on lifted trucks with spacers and Tahoe/Avalanche Z71 springs. For other shocks, users have chosen them primarily for length, and you're trusting the users (I think) to have evaluated the other qualities of the shock with some skill and science. Unsophisticated or inexperienced users might not know what they needed to specify.
In my case, I still run the BDS gas units, but wish I had even more stiffness to counteract the Airlift1000 bags INSIDE my Z71 springs. And adjustability is something I'd look for nowadays, knowing the range of typical PSI that I use inside the bags. I didn't know this years ago, and my expedition weight distribution has changed as I carry less cargo and fewer tools, but have the RTT way up high. And my mix of low-speed rock crawling to high speed desert washboards has changed.