When mine was OTR, it was parked nose down on a slope. We've had a bit of rain here... Well, every time I opened a door water would pour out of the bottom of said door. I reckon the doors were filling up and leaking into the car.
just pulled the seat and carpet from the passenger side. Sheesh, does that underlay hold some water!
Luckily the only rust appears to be surface, so clean it off and paint it and should be good.
Now for the driver's side.

