I recently discovered that our wall in the front corner had separated from the floor due to a screw that broke off. The only reason we noticed it was because we have aluminum siding, and it actually pulled up to the point I could see about a 1/2" of the floor joist exposed to the elements. Technically, if I would have had everything level looking at it from the front, the left side would have been 1/2" higher than the right.
Obviously I can't tell you if this is the issue due to not knowing how your unit is constructed, but it might be a starting point.
The floor stayed level because it's bolted to the frame...then the walls are screwed to the floor in ours.
2016 Grey Wolf 26DBH following a 2014 RAM 1500 Outdoorsman
Life is good...Live it!
(2014) Nights Camped - 16 in 6 trips (2015) Nights Camped - 20 in 6 trips
(2016) Nights Camped - 21 in 7 trips
(2017) at least 23 Nights Planned in at least 6 trips!