It will depend on how you are parked.
I had the same problem and even though my MH was level to my comfort the side the windows kept leaking during heavy storms WAS a tad lower causing the water to run off the roof over that window to that point of the roof faster and heavier than the weep holes could handle.
Solution....I re-leveled the MH with that side a tad higher and the water stopped coming in. And I mean it was ever so little of an adjustment. Go figure.
You can actually see if you stand outside during a storm the volume of water running off the roof to be more in one place. Thankfully changing the angle of the MH rectifies the problem.
Weep holes are designed/tested to drain water from rain not from a waterfall directly over it which is what can happen when the angle of the RV is not perfectly 110% level. :W
I often wonder how many people get talked into replacing windows when it really was not necessary.