I got some Dobinson coils in the rear of the Trol. They're way too firm when unloaded so I'm getting some softer ones.

The Dobinson catalog gives different load ratings for the same coils for different series Patrols. As an example Coil A in a Series 1-4 has a rating of 250 - 350 KG, but in a series 5 it has a rating of 150 - 250KGs.

My Patrol is a 2013 3 litre ST wagon. What series is that???