After re-reading the OP's post, I noticed that this is the Earlton model with the recessed flat door. We have the same model with the same flat door. We have been systematically eliminating leaks
- Pulled and re-sealed all windows
(including the window in the door) with butyl tape.
- Replaced all Hehr window glazing bead seals.
- Removed and resealed several glass panes that were leaking.
- Resealed some of the factory seams in the Hehr window frames.
- Replaced rear roof vent; re-sealed forward roof vent.
- Started replacing through hull fittings.
- Sealed around frame bolt holes and replaced frame bolts.
- EDIT: Replaced and sealed with butyl tape all towing light
We've also checked for leaks several times with a garden hose. Our latest discovery is that we found lots of water coming through the Lyster lockset and resealed around the lockset with butyl tape. We STILL plan to remove and re-seal the door frame with butyl tape. Also, the weather stripping in the door jamb needs to be replaced.
I agree with the previous poster that one of the best ways to track down leaks is to have an observer watch inside the trailer while spraying with a garden hose on the outside.