The SAJ-03F adjustable sulastic model is: - Flexible on load working range up to the truck’s GVWR because it can be adjusted on the limit stops by only using a wrench if it is required. - Used when the truck is constantly under heavy loads and/or for long periods and/or the truck’s CURB weight has been modified by removing or adding weight to the bed as per example: camper, heavy tool boxes, compressors, etc. - When the user is looking for a long-lasting part under extreme load and/or weather conditions. - Best vibration and shock absorption because it has at least 2 times the mass of rubber than the preloaded model. - Best lateral control because the forces are distributed on a bigger mass of rubber. ===SULASTIC IMPROVES: === - Smooths out the ride by just replacing the OEM shackle - Reduce Vibration and Shocks Not Absorbed by the Leaf-springs - Stops the Bed Bouncing - Improve Stability - Reduce Braking Distance - Load & Towing Capacity Not Affected