Its ok if you don't like or want leveling jacks but its also ok to want and like them. I had RV's years ago, and did the drive up on 2X4's to get level, always thought it was a monumental PITA. When we bought our 41 foot DP, it of course had jacks, which worked flawlessly for the eleven years we had that DP. The Gemini came with no stabilizers, no jacks, and I thought because of its small size, it wouldn't be that big a deal, plus we almost always stay in parks with paved sites. Wrong, even being a little off level was annoying, doors swung open or closed, AC dripped water in random places, plus the RV rocked every time anyone walked in it. I had a set of HWH hydraulic auto leveling jacks installed, and for me I would not want to be without them. I frankly do not know of any cases where jacks causes stress cracks or leaks, not to say it couldn't happen, but I suspect, when and if it does happen, its a pretty rare occurrence.
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