It could be the radio is in the chassis position, there is enough drain there to run the chassis battery down in several weeks, especially if it inadvertently is left on. If not that, check that the steps are not either being used often or pulling a large drain - they are on the chassis battery as well.
On our '03 Minnie, we had problems with both draining the battery in several weeks time.
Good luck
Chris
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Chris McVetty
Murfreesboro TN
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