Thanks, Frank. I thought you were referring to a service manual. I have the Lippert master owner's manual. Our GC3.0 actually begins on page 210 of that manual. We have the "Ground Control TT Leveling System", but the point you made is well taken - I'll check the rubber plugs to make sure they are in place.
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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