Not familiar with your motorhome, but I thought most had onboard propane tanks permanently mounted? If so & you say it was empty when filled & only held 20lbs that's not nearly enough, that's the size of the ones (5 gallons/20 lbs) you swap out at the convenience store. Yours could possibly hold 12-15 gallons which is considerably more than 20 lbs.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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