yes,the drw pickup axle is much wider than a srw axle.
yes,you can source a drw pickup with 4.10 and LS.
yes, it sports half an inch more brake pad per side than the srw axles.
no,LS didn't come standard on all drw's it was an option like on srw's.
a sterling drw pickup axle will set you back several hundred dollars,unless you source one from a private party who doesn't know what they've got.
mine set me back $750 and it required all new brakes,new u-bolts to mount it,conversion u-joints (before 3.55's didn't come in the pickup drw in 2nd gen sterling form.trust me on this one lol.) and one sides seal blew for a total pushing closer to the 1k mark.
for what your trying to do,it would be a waste imho.just get yourself a set of wheels with the offset your looking as suggested.a whole lot less $ and whole lot less work.