[Romer]

Note, that selecting your springs based on your weight load should not require the change of shocks Castor corrections or anything else. All the rest of the parts in the kit will be the same.

That allows someone who installed the 2.5" lift kit in a stock configuration to swap out the springs as the weight increases.

For example, adding an ARB Bull Bar and a 9K winch would justify swapping the medium spring (OME851) out for the Heavy Spring (OME850). If you install a 12K WARN and have a dual battery set-up, an OME850J can be used.

Swapping the springs is simple.

The above assumes your tires are 33" or smaller. and you selected your springs to maintain a 3" or less lift based on your installed "toys"
When you go outside the design range of the OME kits, many other factors come to play and this is where the variability of everyones rig comes can give different results. What works for one rig, may cause driveline or Castor issues with another