Ours pulled away on the front side, and there were only 2 screws (but 4 holes) there when delivered to us. They added 2 more screws and more of that black, glue backing. I am not 100% sure it is totally fixed, but I have another 2 months left on warranty so I will watch it.
2015 F-250SD XLT, 4x4, supercrew 6.75' bed
2012 Dutchmen Coleman M240RB 27' TT (traded in)
2017 Jayco Eagle HT 27.5 RLTS