Hey Greg;
I have the Pace Edwards and a Line-X over the rail. The Line-X guy installed the roll-top and sorta screwed it up. When he drilled the holes for the rails for the top, he must have not used a long bit or something because he chewed up the rubber gasket, cause now it leaks a little.
But, I think the roll-top is pretty cool, I would install it myself if I was you. Or find some one who is a slightly smaller goober than the guy who put on mine.
Good luck, BigUgly
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Y2K 2500, 4X4, Auto, Quad Cab, SWB, 4. 10, Black. VA Box, Line-X, PE Roll top bed cover, Stainless add-ons.