I've done 2 of them in a Monaco class A, easy to remove, just take out all the screws on the interior trim ring and use a multitool around the outside to get under the frame (easier than a putty knife and harbor freight sells the tool). Pop out window, put on sawhorses and duct tape the inside pane, then take a center punch and tap glass with hammer and punch and it shatters and sticks to the ductape as it is safety glass. I just removed the inside pane like this and then reinstalled using proflex around the frame. Cost: free