Windows

[jasonj]

I am about to frame my small summer travel trailer, with 2"x2" and 2"x3" laid 'flat' in the walls and corners for studs.
These are 1 1/2" and I will sheath inside and out with 1/4" plywood so I am at 2" thickness.
I have been looking at RV windows and almost everything I find is for 1 1/2" thickness walls.
Are 2" depth RV windows widely available? Did I just search wrong?
I am planning on one larger (approx. 30") window at the front (hitch) end, one 24" wide window on each side and one or two small windows on the rear wall.
Any pointers appreciated

Thank You
Jason