When I first started reading I was going to say to keep the windows because my trailer doesn’t have any windows/vents in the dressing room and I wish that it did so it wasn’t such a cave.
But with a window in the door and a vent plus the lights I’d say you’d be fine. If anything not having the extra windows in the V makes it easier if you ever have to do a quick wardrobe change in the dressing room since you don’t have to duck down! 
Such modesty! I not only not duck, but usually leave the door wide open also 
(Assuming it’s just a quick change into/out of a show top and breeches.)
OP, if you do want more light, you can get the windows and always hang stuff over them. I’m planning on putting up gridwall on my dressing room walls and plan to gridwall right over the windows. They can still let in light that way, and I can still hang stuff since there are other sources of light. Just because they are there doesn’t mean you have to use them 
I think the main objection to windows is that they need maintenance and can leak.
Most don’t, but if they do, it can be a mess.
If you have some, fine, if you are ordering a trailer, then it becomes one more choice to consider.
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