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Tandem-axle trailers depend on matched springs and hardware to balance load between the front and rear axle, and when that hardware wears out, the ride gets rough fast. This AP Products/U.S. Gear kit is sized for 15-inch spring setups on 33-series axles, giving you the parts needed to get both axles working together again.
Double-check your axle series and spring length against your trailer's specs before ordering, since tandem hardware is highly size-specific.