May the suspension become harder with the time? How to ...

I recently purchased a used car (ix35) and have noticed that the suspension feels too hard. The rear is much more rigid than the front. Initially, I thought it might be due to hard shock absorbers. However, after reviewing different ways in which shock absorbers can malfunction, I found that they usually:

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• Become softer
• Start making noises
• Start leaking or sweating

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Can a suspension become harder over time? Is it possible that the car had been used to tow a boat and occasionally backed into salty water, affecting the suspension?

Could it be the springs? Is it likely that the previous owner installed harder springs for towing purposes?

Is there a way to determine if replacing the shock absorbers would improve the situation?

I am considering purchasing softer shock absorbers, but I haven't found a classification system that specifies how hard or soft different shock absorbers are. Do any brands offer such a classification?

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