I have removed and replaced mine. The original window was defective, the dealer delivered a new one to my door and I replaced it myself. More convenient than making 2 trips to the dealership to have them do it.
The windows are installed with double sided butyl tape, available from any glass shop or RV store. I got mine at a local glass shop, 1/8" thick x 1/2" wide, but it would have been better if it had been a bit thicker than 1/8". I used black, but I've seen white at marine supply stores. It's tacky on both sides, you press the tape onto the window flange, then peel off the paper backing to expose the sticky surface that will adhere to the pod. It's sort of gummy and pliable and will bend easily around the corners, and squish down a little to make a good seal.
The window is held in from the inside. Remove the screws in the aluminum trim pieces from inside the pod, remove the aluminum trim, and the window cutout will be exposed. The window simply pushes out from the inside. It's better if you have two people - someone outside with a putty knife to help separate the window from the rPod body and make sure it doesn't fall out on the ground while you gently push from the inside.
Once you get it out, scrape off the old butyl tape (acetone works well to remove residue) and put new tape on the window flange. Start at the bottom in the middle and work your way around so the seam where the tape comes together is at the bottom of the window. Remove the paper backing, place the window back in the opening and replace the inside aluminum trim and screws. Tighten gently until the tape makes contact with the rPod body all around.
If you overtighten, you'll distort the trim and/or strip the screw threads out. Don't ask how I know this.
If you decide you want to use some type of caulk rather than the tape, DO NOT use 3M 5200. This is widely available and has its uses in the marine and RV world, but it's meant as a construction adhesive, not a seam sealant. It's permanent. You'll never get the window out again if you ever need to. Don't ask how I know this.