Your trailer has a "well known stiction problem" that has been documented and discussed numerous times. There is a problem letter that was released by Lippert giving instructions on additive oils to add to your level up system reservoir to help eliminate the "popping/clicking" noise. If you do a forum search for terms like "level up system popping" or "trailer noise", you should get several threads that contain links to the Lippert letter as well as discussions pertaining to the problem.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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