RFK, your pictures look the same as my door, the only difference is the seam is much more pronounced. Mine is about 1/8" high and when I step on the door I can see the seam flex.
I should mention that there was not a seam line until about a month ago when I was using the ramp to walk up and down while repairing the rear bed, (another issue). I load the bikes by riding up the ramp on the sides. While walking up and down I was in the middle alot. I have always made sure the door sits flat on the ground using blocks if needed. I have only used it once as a deck and that was so my english bulldog could sun himself, (He loves napping in the sun).
10x I will take some photos next chance I get, but it looks just like the photos RFK posted.
John And Mary
2013 XLR 27 HFS
2013 CHEVROLET 2500 6.6 DURAMAX
Nights Camped 2012 (7) 2013 (33) 2014 (27) 2015 (34) 2016 (4)