It would be a waste though. The only non Dedicated Transport options we have are the Heavy Slot Battlewagon and Looted Wagon (and really you don't want to put an expensive unit in a Looted Wagon, or really any unit if you can avoid it). It is true that Imperial Armor 8 does expand Transport options so if you take your Battle Brothers I suppose you could put the Nobz in the Warkopter, Big Trakk, Liftawagon or Elite slotted Mekboy Junkas... oh nevermind that, note page 112 subheading titled "Battle Brothers" third bulletpoint.
In reality if you really want Nobs in a transport other than a Battlewagon, why buy the Wagon in the first place? A Ded Trans Wagon looses the Killkannon option (meaning that it can't really go "super" tank), and if you want the Nobz in a Trukk why not just give them that to start off with?
The only time I can conceive of doing this type of thing is if your Heavy slots are already full up and you desperately need a wagon full of shootas, but even then it's a bit naff. True there was high competition for Heavy slots, but with 6th Edition the only really viable choices are Big Guns, Battlewagons and Flash Gitz (Should anyone wish to argue against this comment please do so via PM or opening another thread so as not to highjack).