The tank goes between the frame rails under the bed. The Suburban tank is pretty deep.
Dimensions are 29.75" from front to back, 33.5" side to side, and 13.13" deep
I'm considering one for my '64Dog.

There's also a ford pickup/bronco 33 gallon tank that's a hair shallower. Then there's a 22 gallon ford pickup rear tank that is what I have in my F150.

All in all, look at the Spectra Premium tanks and figure out which one is right for you.

R.