While maybe not ideal, could you relocate the rig relatively close without winter impact? Then go back and get it to load up in December
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I'm from San Diego, so know very little about long term storage in winter impacted areas... But while camping in up to -6 degrees temps, we make it a point to 'cycle' all systems on a regular basis. We have air leveling, so jacks are not a concern for us. But while you are in the holding pattern, could you reduce the concern of jacks being a concern, by just leveling with blocks of wood (Or as above, with cardboard on top?). I can't imagine a few months of the RV sitting on the tires only (If properly aired.) would be a problem(?). Thousands of coaches don't have any form of leveling
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And of course, you should know the normal steps of keeping the temperatures up. Plug into power to maintain battery levels, run heaters and keep tank heaters zones on, etc. I believe I read in the past to be on top of potential moisture builds ups in cold seasons too(?). Heaters on will help some, a crack of the roof vents (If covered and protected from snow/rain on top.), and I believe even dehumidifiers were used by some(?).
I will follow this thread to learn too
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Best of luck to you, and have fun when you do head out
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Smitty