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One of the quickest ways for the torque wrench to go out of whack is proper storage. Most instructions say to store at 0 or the lowest setting. This prevent the spring from compressing and gets.
And as for the OP, once the U-bolts are torqued, they should maintainn their torque for a while. But the trailer wheels should be checked prior to each trip, since the wheels are especially stresssed when driving and the trailer is put through any turns. The trailer axles don't have a differential so the straight up and down caused a lot of stress on turns. The wheels also need retorquing when they are removed for whatever reason.
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