As my YJ gets older the springs are starting to sag. It has a 2.5" lift. When I look at repalcement springs there are a wide variety just in the 2.5". So my question is, if the Jeep has a few add ons (winch and bumpers) that have added to the total weight, but not considerably, do I need to replace the springs with light, medium, or heavy load springs? I don't plan on adding any more weight to the Jeep, and I'm not lifting it any higher. Any suggestions?