Shell leaks

Hi. Got a used Leer shell last February. A few issues but I'm on a lousy dirt road so I expect some of this stuff. The shell is surprisingly good at keep dust out but not good at keeping the water out when it rains. Luckily not much rain here. Just had a couple good downpours and I started to look for the problem areas. The side windows have little half inch vents every foot or so and they flow water through. Pretty sure the windows should come off and get resealed but I hate to go through all that and still have those vents leaking. Any thoughts? 2011 longbed.

 

Pull the windows/vents and put a good bead of silicone around them and reinstall.