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Most members recommend replacing the original 2020 Sailun S637 tires before a long tow from northern Wisconsin to Florida, even though they still look new. The main reason is risk reduction: several experienced RVers said older trailer tires can fail despite good tread and no visible dry rot, especially when storage history, inflation habits, towing speed, heat exposure, and prior loading are unknown. A few members noted Sailun is generally considered a solid brand, but that did not outweigh...
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Most members recommend replacing the original 2020 Sailun S637 tires before a long tow from northern Wisconsin to Florida, even though they still look new. The main reason is risk reduction: several experienced RVers said older trailer tires can fail despite good tread and no visible dry rot, especially when storage history, inflation habits, towing speed, heat exposure, and prior loading are unknown. A few members noted Sailun is generally considered a solid brand, but that did not outweigh concern about age and uncertainty for this trip.
The strongest support for replacement came from members with high post counts and long tenure who shared direct blowout experiences, including one reporting two blowouts within 800 miles on tires that appeared fine and another describing repeated blowouts on a Montana fifth wheel. One member cited a 2020 NHTSA recall affecting some Sailun tires and advised checking the date code against the recall notice, which adds a concrete verification step. Members also pointed out the possible cost of trailer damage, with one reporting $9,500 in damage and another warning a failure could damage the camper floor. Practical suggestions included replacing the spare too, upgrading from Sailun S637 80 series to 85 series for more load margin, and reselling the removed tires for limited off-road trailer use.
Trustworthy sources: 8 posts; Untrustworthy: 4 posts. Core consensus points: replace the tires before travel, age matters even if tires look fine, blowout damage can far exceed tire cost. Outliers: one member said they would run them. The original poster accepted the consensus and decided to replace all tires before the trip.