My Dad just bought a Duraliner for his 2001 screw. Is this installed correctly? All truck liners I've seen the plastic went under the rails. The bedwall on the Supercrews pop inward in the center and don't leave much(really any) room for the bedliner. Is this right or am I risking rust damage from moisture?

 

Judging by your pics, id say they go in under the bed rail - they shouldnt be floppy to the inside( i wouldnt think)