Tank is 18#. Small for a Class A but that is what Winnebago puts in them for this series.
The valve is closed tight and there is no leak. I hope I am smart enough to know that you do not play with propane so I would leave any repair to a professional. I thought (dangerous thing for me to do) that if I came on here there could possibly be a simple fix, but, this IS an RV so there is no such thing as a simple fix.
An RV is defined as a hole you throw money into. Really, I enjoy the RV and will get it fixed at the first opportunity.