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I have owned my Safari 30 for three years now almost to the day. I have done two bearing re-packs since new myself and I can attest to the need for this annually. Last year I used the high temp Mobil 1 Bearing grease and this year I just opened them up and it had alot of liquid grease in there, maybe it had gotten hot? The bearings had a slight discoloration but no pitting or galling.
For my trailers weight and use, (I towed 14k last year), I will stay with the recomended intervals.
And yes, the double lip seal will keep your drums clean inside as I have used both!!
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