I've got some dents on my passenger side rail that I want to cover up and I want a bed liner because.. well, just because. The shop near me is running a Christmas special doing Line-X for $400 installed (that's a good price, right?) and I'm thinking I'll go with the under the rail option since I'm going to be putting the BED RAIL CAPS on it. However, I'm worried that there might be a gap between the top of the liner and the bottom of the rail cap. Has anyone had experience with an under the rail liner or tried this combo on their truck? Thanks!