Tighten all lug nuts to the specified torque of 120 ft-lbs.
It is critical that the wheels be properly torqued at the start of the trip and every 50 miles for the first 500 miles of road operation. Although the wheels have been properly torqued before leaving the manufacturing plant, settling and wearing in of components during the first few miles of operation may cause some loosening of the wheel nuts.
The manual also says:
It is critical that the wheels be properly torqued at the start of the trip and every 50 miles for the first 500 miles of road operation. Although the wheels have been properly torqued before leaving the manufacturing plant, settling and wearing in of components during the first few miles of operation may cause some loosening of the wheel nuts.
For most of us, those first 500+ miles on our trailers were probably made by a delivery driver from the factory to the dealership.
Whom I'm sure probably never stopped every 50 miles to check the torque weight of the wheel lug nuts.
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I think the "check them several times in 500 miles" is a CYA thing for any screw ups in assembly.