I really d not know much about burbs. I do know that they are gorwing on me greatly and I would love to have one parked in the garage (after I get that built) to strip down and rebuild as a family/travel type rig. I have no idea about how common some of the options would be. Maybe some of you burb gurus can help. The options I am really interested in are a/c with the rear heater-a/c setup (which I nothing about just read somewhere they had it) and the rear barn doors. How common are these two options? And are there different years that do or do not have them?