I run a Puma with the tank. I can't understand why some remove the tank when the only reason that makes sense is for room. And then a lot of these Puma users that "conserve" room by removing the tank, carry their spare tire inside.
Some even have a custom rack that holds both the spare and the Puma. For me, the advantages of a tank, even without air lockers, far out weigh the disadvantages. My Puma is mounted in the back, on the same tray that my fridge is on. Works for me for airing up tires and other purposes while leaving room inside my 80.
This pic shows both fridge and Puma placement before Delta attic and RH shelf:
This is after Delta installed, but with fridge removed:

This pic shows both fridge and Puma placement before Delta attic and RH shelf: