Update: after replacing the leveling jack pads with the redesigned pads my popping noises continue. The noises can come from any of the four jacks and don't appear to consistently follow any pattern although generally they don't begin until an hour or two after leveling. They also appear to be more apt to occur when there is a temperature swing of 20 deg.
Equalizer wasn't much help and quit responding to my emails when I argued with them that the system was still under warranty because the documentation in the motorhome said it was warranted for 2 years. Equalizer's position was that it had a one year warranty.
I contacted Randy Houser to get help and begin to pursue warranty resolution. But I attempted one last thing to resolve the problem. I have read that Lippert recommends the addition of a Catapillar product 1U-9891 Hydraulic Oil Additive. I also read about one Entegra Motorhome that was having the same issues and Equalizer recommended the same additive. I could not get an official position from Equalizer about using the additive so I removed all the ATF from the hydraulic reservoir (about 5 quarts) replaced it with 4 quarts of Mobil One synthetic ATF and 1 quart of the Cat additive. Now, 5 days later after cycling the jacks multiple times the popping appears to have gone away.
This may be premature because the weather here in Tennessee has been unusually cold with no real big swings in temperature but I will update in a few weeks. Hope this helps others if they have this same annoying problem.
2013 Berkshire 390RB-60
toad - 2002 Jeep Wrangler Sport