Specifically asked previous owner if there had been any damage or leaks to the unit and were told 'no'. When we pulled the tile up to see why the floor was lower in that corner, it was wet right in that low spot. However the floor and walls feel very solid. The floor even in the low spot is sitting securely on the frame... almost appears to have been manufactured that way...
Checked for leaks on that wall and can't find any evidence of any. No stains or soft spots anywhere. Checked roof, windows, awning connection to trailer, etc and all seem secure. We can not find anywhere water is leaking in. We are hoping the wetness came from the wheel well as it was not well attached on that corner. Plan to put sealant around wheel well frame and re-attach with additional screws... will leave floor exposed and monitor area to see if it gets wet again and under what conditions.
Any one with any similar issues or ideas of where the water could have come from, we would love to know. Was going to actually post this question about the wet floor elsewhere so ADMINs please feel free to move if it is better suited elsewhere... new to this forum.