No gas thruout the trailer? Not even the stove? You have a blockage at the supply tanks, possibly the auto changeover valve. They do go bad.
Your fridge does not work on gas, either? Obviously, double-check that you aren't low on propane in both tanks. Get the supply verified, check that the changeover valve is operational. Propane flows like water--from origin to use points--need to figure out where it is being blocked, or if it is even coming out of the tanks.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired