I would not worry about the front window if you seal it up right..The most un-noticed source of leaks are the clearance lights,in my opinion.Every camper will leak if the owner does not keep up on maintenance,even new campers.Just because it is new does not mean it will not leak because of human error.
I have been lucky with front window leaks..My last Lance developed a front window leak and I was on it immediately and sealed around it for it never to leak again.
My Jayco FL fifth wheel with a front window never did leak but they had an adjustable fiberglass type cover to open and close it.I think something like that should have been part of front windows on all models.
Keeping any camper from leaking is a full time job..