We own a 2012 FL. We've never had problems with our tanks. Have traveled thousands of miles with tanks both full and empty. Valve problems have been our only issues related to the tanks.
Bob and Debbie (both retired) with Senior FurBabies Grizz (a German Shepherd mix) and Bailey (a Lab mix)...and sometimes a Grandkiddo or 2! Full Time RVers since July 2013 Redwood: 2012 36FL with sliding patio doors
Tow Vehicle: 2011 Chevy Silverado 3500 HD with 6.6 DuraMax Dually