We have a new 313 TT. We also have light coming in from the bottom corner when the BR slide is closed. The bottom left corner is pretty consistent, the bottom right is off and on. This is really not acceptable. Slides have been around for a long time. I have had another trailer with slides. that trailer was cheaper and allegedly less well made, but the slides closed all the way! there was no large gap between the skin of the slide and skin of the trailer when closed, and no light showing thru when closed, even if not perfectly level in all axis when closing. Not only does an opening large enough for light to come thru an easy access point for bugs and other critters, I'm concerned about pulling the thing in the rain. How soaked with the inside floor be?