guess you need to know whether you want it over the rails or sitting on the bed floor. I have both styles. the one over the rail is deep (goes to about 4" from the bed floor). With the crew cab i didn't want it sitting up there as it was hard to see over even with the extended cab. that was why i bought the chest type that sits on th floor and is flush with the top of the bed.
I am not using either one now as i got a fuel tank with tool box on top now.
My old weather guard was awesome had it since 1992 welded my rack to it painted it 2 times my dad has it now. but i bought a fifth wheel so i needed a chest styl couldnt afford weatherguard this time i got husky from home depot not the greatest but gets the job done at a good price the diamond plate is the way to go
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