Thinking hard about Airstream Sport

My wife and I are looking at new airstreams. Our tow vehicle is a 99 Jeep Cherokee with Towing package ( 5000# capacity ). I like the 16' but an a little concerned with the shower toilet not being separate like the 22'. It's just my wife, dog, and myself. Also what is the difference in a sport 16 and a sport 16 JNB? Please pass advice and experiences. I Plan on buying this late spring or summer.

Thanks

Ron