Have your trailer weighed and see how much weight is being put on those tires. Then buy tires rated for the weight that you carry. Be sure to look at the wheels as well.
Also, if you're having blowouts, there could be an issue with the suspension/alinement. The suspension on the Redwoods seem to be the weakest link in too many cases.
Good Luck
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SOB "The RV Wiseguy"
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