The load rate is how much weight a spring will support at a certain height, spring rate is how many pounds it takes to move the spring one inch from that height. Put a couple of hundred pounds in the trunk and the car will lose one inch IF the spring rate is 100 pounds, two springs taking 100 pounds each. Springs can be made to carry the weight of our cars with a variety of ride heights and still have the same spring rate. The challenge is knowing ahead of time, what height your car is going to sit at after the springs are replaced. A lot of guys have R&R their springs more than once to get the height they want. I've had the front springs off mine four times and really don't want to go through that with the rears.
