Water leak through rear fire escape window

We had that happen in a previous MH. I bought some 1/2X1/8 sticky-back weather stripping at Home depot and put the sticky side on the frame, starting at the hinge on one side and going all the way down and around to the hinge on the other side. It made the window much tighter when you pushed the locking levers down. It stopped our leak. I planned to put a drip eave over the window like you see over some of the doors on some older rigs but the leak stopped so I never got around to it.

The water leak IS a problem, but driving through a storm is kind of unusual conditions to be fair. If it was mine (depending on how much water) I may consider just taking a hose outside to the window and see if it leaks.... But I would use the phone like regular rain that trickles down, rather than storms with puddles while driving splashing water in who knows what direction.

Resealing windows in RV's isn't that hard - there are YouTubes showing the process. The window is essentially sandwiched between metal frame - the screws to the frame are located on the interior - you remove the frame/window - scrap off all the old butyl tape - apply new butyl tape - reinsert the window - trim the oosing butyl tape - and place a bead of caulk on the exterior. First time through might take you about an hour. After than you can fix the other windows pretty quick.

Hope this helps.

Did you ever open the window? Why I ask is because on our motor home we were told never to open escape window except for it's intended use. They told us if we ever opened that window it would have to be resealed. If it's a new RV the dealer should reseal the window.