It was probably in one of the big floods and a fly-by-night repair shop replaced the interior paneling and cleaned it up the best they could. You shoud see a high water mark about the top of the windows!
It looks like a 2005 model to me.
KIDDING! Really I am.
I bet the paste over was done to correct and error in capacity or something like that. It is normal for 2015s to arrive at the dealers April / May 2014 and one of the tires was made in 45th month of 13... 1st of November. This would sound to be normal and not odd. Thats about the same as my 2015 XLR. I haven't looked at appliance dates, but it wouldn't suprise me to see 2013 dates. Like a member said, look at the VIN stamped into the frame, that will tell you what year it is. I have seen trailers that got new stickers, similar to yours.
XLR Hyperlite 29HFS
Ram 2500 6.7L CTD
A Modder's work is never done!