My 2014 trailer would have a puddle of water in the middle of the floor after a rain. But this was only when the awning was closed. Three trips to the dealer and they kept telling me the rain was getting in around my water heater. the pulled the water heater and reinstalled with new sealant. The trailer still leaked. While on a ladder one day I found the window above the water heater had the gasket installed upside down. The expansion joint was on the top of the window. Rain ran right in the joint and down the wall.
Check the window gaskets.