If you look at the 2013 March capture, the notes at the bottom of the specifications state that you must add 6" if you choose the roof vent option, or 14 1/4" if you choose roof AC. This note was not captured for some reason in the September 2013 capture.
If you look at your March 2015 capture, the notes stat you must subtract 6" if you do not choose roof AC. Note that the subtract 6" is the difference between roof AC and a roof vent. If you did not have anything on the roof, you'd have to subtract about 12", which is pretty close to the "add 14 1/4"" for the 2013 specification.
The 2013 width specification states you must add 5" for the awning and clearance lights. The 2015 specification includes an awning and clearance lights. If the awning is not included, the 2015 specification states you just subtract 2". The reason you only subtract 2" is because you cannot remove clearance lights.
The difference in dry weight is only 100 lbs. This should be without any options, but what would TM consider as no options? I can't answer that. However, 100 lb difference is not significant. When you load it up with all your gear, add the battery (100 lbs right there), fill the propane (40 lbs), fill the fresh water tank (300 lbs), food, etc, you are looking at adding 1000 lbs easily. When towing, you should consider the GCWR of your tow vehicle. You may be under the limit for your trailer dry weight, but by the time you load the trailer, and put people in your TV for a trip, you could be over the limit. Four adults can add 600 lbs easily!
(So, 100 lb difference between 2013 and 2015 is not significant.)
I hope this helps.
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