The Lootas may have a separate inventory. Orks Lootas (or whoever else) could own the Loot of enemy vehicles and Upgrade of their own Trukks with simple notifications and key-presses. Deathskulls, however, can own enemy vehicles and 'Ork it up!'. Am i right? :O
I think the Looted Russ, while iconic due to DoW, may want to be forgone in favor of heavily orkified Predators, Battle Wagons, and other Ork constructs, if only to look more like the Orks are really looting the battlefield and using the enemies own shattered vehicles against them.
Oi ye gitz! Nun o ye iz tinkin' dis un o'er right! If ye gunna be lootin den ye gunna need DAKKA and ye gunna need de planning of de W'AAGH! Witout it dere be no good Lootin. If it's good lootin of all tings dat ye seek den find Me or De Mightiest Freebooter I ere dun followed, Crackersmasher, we be leadin de Loota Takas, a bunch of us Deffskull Boyz dat iz gunna be lootin al tru dis ere W'AAAGH! (Seriously though, we have two recruiting pages up, check'em out)
oooh! Please a looted leman russ! There would be so much opportunities for customisation and different loadouts :>