Wheel well repair time! Well, wheel well sealing time. :)
Before I lay any new wood in this trailer, I want to seal it up: no more leaks! the wheel wells showed such poor sealing on both sides, that I decided to seal them both up.
After I cleared the black spray foam insulation out of the way, I saw a manufacturing defect: the wood core in the bottom plate of the outside wall had slid into the wheel well during fabrication. I know this because it wouldn't budge, and it most likely has a few dozen screws holding the core in its present place. what surprised me, was that the quality control at the plant didn't pick this up, as it resulted in the wheel well being pushed towards the wheel.
So I decided to remove it:
Then I decided to attack this from 2 angles: making a gasket material to seal the well to the trailer framing as well as fill in the big holes. The next step is to cover everything with RTV silicone. The gasketing material I used what whatever I had on hand: I used basement crack repair (like a glue/rubber compound that has great expansion and contraction properties) for the worst parts. The other parts I used masonry silicone because it has similar properties (and I had this on hand).
I sealed everything up with RTV silicone then.
And on the driver's side (which was better):
