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How to calculate the correct trim load to put in airspring setting?

Hello,
 
I have a rigid axle model with airsprings on it. Running the analyses I have to set the airspring into "Trim Load" rather than "Auto Trim Load". However, when I am trying different trim loads, I get totally differnt results for suspension characteristics, such as Roll Center Height, Torsional Stiffness etc.
 
When I set the axle to be rigid the variation is much lower while in a flexible axle the results are different in a wider range.
 
According to the calculation process for Auto Trim Load and Trim Load I can rationalise those changes in the results  but now the question is how can one calculate a reasonable value to put in for the Trim Load setting?
 
I've attached a picture of sample runs which I did for rigid and flexible axle including different trim loads as well as Auto Trim Load.
 
Thanks in advance for sharing your experience and knowledge.
 
 
 
 
 

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