The rear camera on my Minnie Winnie 22M is clear, unless road dirt runs it afoul. The side mirror cameras are another issue. Both cameras get foggy after the vehicle has been operating for a half-hour or so, with the passenger side being the worse of the two. Cold weather seems to accelerate the blurriness, and it is not surface fogging of the lens. The dealership has replaced my right-hand mirror camera already, but the replacement camera has the same fault. I am scheduled for another visit in a month to evaluate my cameras and hopefully replace them with revised cameras. I cannot help but believe that Winnebago knows of the problem with these parts, and I hope they will replace both mirror cameras without opposition.
2019 Minnie Winnie 22M on an E-450 frame