Your tanks are heated thru the basement heat, which is forced hot air from the furnace. No tank heaters on the Winnies.
I would not worry about having your tires sit on concrete for 3 weeks. If you were sitting for 3 months, then some sort of vapor barrier might help.
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Don
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX
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