Is it leaking while parked or when you are towing in bad weather? I've dealt with leaks on the front of our 195RB under both conditions. It sounds like you are seeing the water seep in about the same place mine did - right along that trim strip that covers the seam between two pieces of siding under the window. Ours was just to the left of the window when looking at it from inside and would get the head of the bed damp as well as leave a little puddle on the edge of the bed-side table. I believe I ended up finding 3 different ways the water was coming in:
1. Around main window frame - used Dicor no-sag and caulked gap between the window mounting ring and the siding all the way around the window, replaced the "D" seal material on the edge of the rock guard and replaced the seal between the mounting ring and the glass itself
2. Gap in putty used to seal the driver's side joint where the front and side come together. In this case when the trailer was not quite level but leaning towards the drivers side the water would stick to the bottom of the siding and run to the edge and into the hole which I could stick a toothpick about 3/4 of the way in. Used Dicor no-sag to caulk the entire front edge seam, top to bottom and both sides.
3. Gap in the overlap between two pieces of siding. This would only leak when towing in rain. Used Dicor no-sag to fill the gap where the siding overlapped for all seams top to bottom on the front.
In addition to the above items which I did as a direct result of seeing some water seep in under that trim strip I also use Dicor no-sag all the way around the running lights on the front as a preventive measure. I don't think they were leaking, I was on a roll and just did them as a precaution. I've since done the same to all the remaining running lights.
This season we towed a couple of times in some very heavy rain and had no leaks or moisture seeping out of the trim strip up front so it looks like with all of the above done it stopped my issue.
Good luck - I hope you are able to get it under control. I know I was somewhat frustrated after fixing what I thought was the issue only to have it appear again another time or two. The DW can attest to a few choice words being used in regards to this issue...
Also, I've got some pictures of the various steps I did above if you want to see any of them for reference.