Depends on how often you want to be broke down on the side of the road. Lol!
In all seriousness, you don't necessarily have to repack them. If you bought it used it would be a good idea to take them apart, clean off all the old grease, and repack them with the grease that you are going to use. Some greases don't play well with each other when mixed. Once you have them packed with your favorite brand of grease, stick with that brand. If your axle has the zerk fitting on the outer end of the spindle, all you have to do is lift the trailer by the frame and not the axle just enough so the tire will spin freely and give it a spin while you pump a few shots of grease in there. Yearly is advisable, unless you are pounding tens of thousands of miles on it a year. I generally do mine at the start of the camping season.
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2017 North Point 375BHFS
2015 Silverado 3500HD Crew Dually Dmax 4x4
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