If your floor is having issues and it's a 2013 model maybe take it back to the dealer to have them look at it. Putting another floor down will increase the weight of the trailer, so you should be careful there too.
Model X19H Expandable
GMC Sierra Pick up
Been a camper since I was a kid, and that was a long time ago :)
From pup tents with no floors, to tents with floors and flies, to a pop up, to the expandable.