The chains on my 2503S were too tight. It didn't appear that way, but when I brought it home from the dealers, i got the TV almost 90 degrees to the trailer backing it into my driveway. Heard a loud bang and you can see the results below. Had a local place reweld with longer chains.
I thought it was a fluke, but now I'm not so sure. I think you're the 3rd person with chain problems recently.
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10