The cracking just seems to be weathered plastic that has become brittle.
Does not seem to be something to be worried about.
I would remove them.
It's possible that the spring perches have slipped.
Tires wearing faster in one corner?
Sounds like you need an alignment.
Your toe alignment specs are probably off.
And since it's in one corner, does it happen to be the one end that is lower than the other 3?
Could be the reason for the off alignment.
Goodluck.
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