Leveling Jacks Making Noise

They are no doubt Lippert hydraulics. Our 2015 Winnebago Vista Class A jacks made those noises (snapping and popping) mostly at night as the temperature cooled and the hydraulic fluid contracted from the day we got it new. You could feel the coach drop a little each time, too. Also, when I'd retract the jacks, the first movement made the coach feel like it fell a little as the pressure released and the jacks began to retract. I complained regularly to Winnebago and Lippert and spent money buying the Caterpillar oil additive and the motorcycle fork oil they recommended. The term for what is happening is "Stiction" of the seal (not the outside seal that keeps the oil from leaking down the shiny jack but the inner seal on the piston dividing top and bottom of the cylinder). Each time the symptoms would abate for a while then return after a few months. Hoping "the squeaky wheel would get the grease" I continued to complain and eventually, about a year after the warranty expired, Winnebago had Lippert send me four new jacks. They said they would allow 4 hours of labor to change them..just send them the receipt but none of the RV shops around here would do it for that. I found that changing them was quite easy since the coach is high enough not to require jacking up so I just did it myself. Problem instantly ceased and has never done it again. Don't believe anything they say.. IT IS THE JACKS. What really got me hollering at the end is one of our friends bought a new Forest River coach with the exact same jacks and theirs would be silent all night while even they could hear ours popping! Apparently the internal seal is to blame and there was a bad run around 2014/15. You did not have your rig info in your profile but I am assuming it falls in that time frame, probably too long for warranty help now. You may want to try contacting Lippert to see if they will give you any discount on a new set of jacks. The difference in "enjoyability" would make me not think twice about paying for a set now that I know that it is a "for-sure" cure.