I don’t think that the CO2 sensor should go off, you should be able to drive down the road with the fridge on gas. You want to check the chimney vent from the roof to make sure you have not had critters build a nest or something similar in there.
Sorry, can’t help you with the suspension other than check the shocks for play.
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GrantR
Itasca Ellipse
Silverado Duramax Toad
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