Polly bushes will not last long if you use the vehicle off road. If a normal bush there are no moving parts. In a poly bush they move on the innner spacer and on the outside to the arm. Therefore dirt and mud gets in a chews them out very fast.
The other wear part on bushes in general are the bolts going through the centre. If they show any sign of wear they should be replaced, other wise you will still end up with slop in the the bush.
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