During the manufacturing process, all shocks are built with a certain "dampening rate" design with either dual action (dampening both directions) or single action (dampening one direction).
My humble opinion (which is probably not worth a lot) is that the shock was designed with the weight and bounce specifications that were tested and best results. If they needed twice the dampening, they could just design it in to the original or, (in the case of wanting an upgrade) the replacement part....
Larry, Stephanie Park City, Utah
2017 31SL King, 8K axles, Disc Brakes,17.5 Goodyear H tires,BU Camera,5.5 Onan, Heated HT pads, Two Uniguard Awnings, Slide Toppers, 2000w PSW inverter