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Check your tyres regularly, here's an example.

This tyre looks ok doesn't it.



Now look closer.


Closer.




You should check both sides of the tyre for cracking /
bulging, the best way to do this is to remove the wheel
from the caravan.
If you are unsure of how to remove a wheel safely seek help.
If your tyres have even the sightest cracking get them replaced.