Fixed window replacement question

Is this on the front of the trailer, as opposed to the side or the back?

I would worry some about water intrusion when driving in the rain if it's a window on the front of the trailer (and there's no protective cover or something over it). Otherwise, it should be a pretty straightforward if possibly awkward job. RV windows typically are held in place with a clamp ring on the inside with a plethora of screws, and the outside sealed with butyl tape or some very similar caulking material under the flange.

http://www.motionwindows.com
they will make what you want.
i have used them to make replacement windows for my fogged ones.
did a good job and very reasonable

I have never done it but, I would not hesitate to try. I don't think it's any more difficult than replacing/installing Windows in a S&B. I've done that many times.

Do a Google search for 'RV Replacment Windows', you will see what is available.
Did you check YouTube? I'm sure you will find videos on replacing RV Windows.

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