On both driver and passenger walls there are small bumps. Hard to see them in the pictures, but that was as good as I could get after many tries. Both walks feel solid, but since it directly below the sliding windows U think its a water problem. I canít see where the water is coming from. Any others have this problem and hopefully a solution. I have a 2016 Vegas
We had the same thing with our 2016 24.1. We had Redlands Truck and RV remove both of the windows to solve the problem. The joint between the front cap and side walls was secured with about four screws. The joint was covered with a piece of molding that was not water tight either. Found out that the water was leaking through that joint and ending up in a pocket under the side windows. I had a business that handles water damage go to the shop with a pretty cool digital scope look at the walls to see exactly where the moisture was. Cost me almost $2000 to find this issue.
Taking the molding off, the cab actually overlaps the side, so I don’t think water is leaking there, but the molding actually goes into the window seal and there was water in there. So, I think sealing the window abd cutting the molding so terminates at this seal will fix it.