Please help with measurements

Hi
I am looking to purchase the 20k pullrite superglide, I believe is upgraded from the 18k.
I would like to know the dimensions of the slide rails as I'm working out how much room is left on the standard deck of a new chevy silverado 3500.
The reason is to work out what tool boxes I am going to purchase for the deck front and back and maybe the sides. I appreciate this as I'm about to order the boxes any day now.
Thanks in advance
Paul

I can't give you any numbers, but maybe you can get the dimensions off one of the manuals for the Superglide installation.
HERE IS A LINK that may help you out.

Peace
Dave