Bedroom slide leak

[flash01]

I have a 2010 5th Montana 3400RL. I am having leak problems in the bedroom slide. Standing at the foot of the bed, facing the head of the bed the floor on the lower right hand side at the head of the bed gets wet during a hard blowinig rain. Does not matter if slide is in or out. I have checked seals, caulking and also made sure slide is extending and retracting properly. Cannot figure out how the water is getting in. No water stains on walls or ceilings. Anyone have any suggestions on how the water is getting in.
I traded in a Hitchhicker LS that had the same problem. I sure was hoping a new rv and a different manufacturer would make it so I didn't have leaking issues. You would think what one pays for these rv's they would not leak. I noticed mine leaking the first hard rain that I was actually in the camper. Of course that was when the rv was already out of warranty.

Any suggestions would really be appreciated.

Thank you