Full Progressive Spring Pack Heavy Duty Carli SuspensionCarli's custom made progressive spring packs by Deaver Spring Mfg are designed for both weight capacity and smooth street performance, ideal for mid sized Slide In Campers with up to 1,500lbs. in the bed. Features and Benefits: Specifically designed for (2003 2009) Dodge RAM 2500 and 3500 Provides a 2 inch lift to match Carli 3 inch front systems. Ideal for mid sized slide in campers with up to 1,500 lbs in the bed Ensures optimal weight capacity and