I once lifted the rear tires trying to level our 2014 Allegro Bus in a very unlevel camping site. It didn't cause a leak.
Are you sure it is the bag and not the lines going in? I believe there are quick connect fittings, and if the line got too extended it could cause a leak. Get some soapy water, or a bottle of leak detection solution from home depot/ lowes. (I prefer that stuff because the bubbles are easier to see. )
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