So you're saying that the exposed edge of the diamond plate is cutting into the cushions? I might try to take a long piece of rubber tubing (small, like a fuel line or even smaller,) slit it open and affix it over the edge of the DP (like with glue, clear RTV, etc.). This would cover the exposed edge and prevent further damage, yes?
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)25
2014 Harley Davidson FLHX (XLR cargo)
2014 VW Jetta TDI (diesel sipper, camping support vehicle)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)