I bought a set of the regular 4/1 springs from them and they rode fine. Bushings were offset and caused rattling. Fixed that with an air hammer. Only ran them 2k miles then replaced with Rusty’s 4” springs. I wish there was an option for taller springs and still stay SUA. I carry approximately 800# of tools in the bed at all times and even with overloads maxed out, I’m sitting dead level with 5” lift up front.