The reason for considering it, is that I'd like the ability see in all directions from inside the camper, and ventilation of some kind would be very nice in that location if it was hot at night. A fan in the back would pull air through. I think I remember Andreas claiming that Tern windows would not leak in that location. The camper is fiberglass and foam, so a leak wouldn't ruin anything at least.
This is the only example I've seen of someone trying it... an old Avion camper that originally had a sliding window in the nose. He (or she?) links to it elsewhere, and it's a Maygood window. He said it actually did leak when he first drove in the rain, but that might have been because he'd failed to remove a piece of plastic. I didn't see any mention of the window in later posts.
The cabover windows have been a source of much angst among the Roam Lab crew. It’s one of the most visible windows. It also leaks. While we are reticent to change the exterior appearance of the camper, this is our most notable deviation. We first looked for two small windows to match the...
roamlab.com