Can you reuse trailer axle U-bolts?

It is generally not advised to reuse trailer axle U-bolts once they have been placed and torqued to a certain level. This happens because U-bolts can weaken or distort over time, which means that their clamping force may not be as great as it was initially. Furthermore, the U-bolts' strength and structural integrity may be further compromised by rust or  other damage sustained during operation.

As a result, anytime trailer axle U-bolts are removed or dismantled, it is usually advised that they be replaced. This is particularly true if there are any indications of wear, corrosion, or distortion on the U-bolts. The suspension system of the trailer is safer and more reliable when the U-bolts are replaced. There is also a lower chance of failure or damage occurring when the trailer is being used.

To sum up, it is not advised to reuse the U-bolts on trailer axles. Rather, they ought to be changed each time they are taken apart or dismantled, or if they exhibit any indications of deterioration, wear, or deformation.