Tonneau Cover Questions

I know there's a few topics on this but I'm after a couple things in particular. I'm looking at Roll n Lock and Pace Edwards and need help with a couple things. My dad has a roll n lock on his 250 with the Vinyl top. I was wondering if the aluminum finish would scratch easily like we were originally told when he bought it. The other question concerns the canister height and length in relation to the bed. I don't want to buy one the takes up a ton of bed space. So if it isn't too much trouble could I get a few measurements for both covers. I appreciate any and all help.

I have the backflip and love it


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