It's a 32" wide door with insulated glass and it costs over $1200 wholesale. I like the extra width because we like to use residential sofabeds (much more comfortable then RV couches) they won't fit through 24" or 26" wide doors.
We typically use that 3M film that makes the window look as i it's acid etched. Helps with security. I agree a sliding window would be nice in the door.
Tony
ToolSet Motorhomes