We've been very lucky with our 325, which we bought at 8 years old from the original, very fastidious owners. We've had one water ingress problem resulting from a rotted slide topper combined with a rolled-over blade seal in the living room slide ceiling. We had the seal fixed and new toppers installed, but, over the off-season, the cabinet woodwork developed mold, so I'm about halfway through building and installing replacement cabinets.
We still have a couple of other issues. The bottom-face blade seal on the bedroom slide has rolled over for about a 6" length, so the next task will be to lubricated it with graphite - shouldn't be a big deal, but the gap down at that corner is big enough for squirrels to get in.
The other issue might be more complex, and I'd love to hear from anyone who has experience of it and fixed it. The forward-most cargo door on the driver's side isn't closing properly. The lock/striker work fine, but the aluminum angle running along the top of the door aperture, where the door hinbes are attached, seems to be pulling away, leaving the top of the door not flush with the sidewall above it. I can't find where that angle piece is structurally attached. I suspect there may be some wood rot in the cargo bay outer ceiling. It's not a show-stopper, but it is a concern.
Frank and Eileen
No longer RVers or FR owners