I feel your pain. We, too, have experienced leaks in our 199FKS while driving in the rain and snow. I took the unit to the factory in early March and picked it up in early April.
Here's the synopsis of what they performed while they had it:
Quote: Danny replaced the bulb seal and redid the seal around the exterior of the door. The seal at the license plate holder was broken. Looks like some water got in through the hole there for the wires. The light was also broken. Danny put on a new Light and resealed the holder. He also sealed the unit at the bottom around the entire perimeter where the floor meets the metal. The slide out was gapping about ½” by the front T-Molding. Danny added screws and resealed the front and the back. Danny believed that water and salt got in there. We also tightened the entry door latch so it would seal better to the bulb seal. There were air leaks at both sides of the bottom of the entry door. These were caulked at each side of the bottom of the entry door. Danny replaced both taillights and caulked around the water heater. There was a hole in the lino under the exit window. This was filled with a seam sealer. Danny ran a dehumidifier to dry and pull out moisture in the unit. The floor was damp and slightly swollen. Also checked the floor under the bed. Danny sanded the floor and bonded in areas and the floor is solid. The bathroom floor is dry and solid as well. Danny also covered seams with battens strips vs. the seam tape.
Unfortunately there was no rain on our trip back to Memphis. We are pulling it to Pensacola in about three weeks and hope to run across some rain to see if the fix is in place.
2017 Riverside Retro 199FKS named Brew's Fault
Dog's name - Brew Camping, boating and music enthusiast Love Leonard Cohen Retired U.S. Navy submariner but still have to work!