I would'nt be too concerned about them backing off once you have made sure the nuts are properly torqued. Our unit has covered many miles and many rough roads in six years of fulltiming and I had 2 nuts that turned maybe 1/8 of a turn. If you Loctite them and damage or stretch occurs to the u-bolts you won't know it because the Loctite will keep the nut from moving when you put a torque wrench on it.
|