you can a locker for about 1K new or factory maybe $500-600 if you look around enough, given the 2 options i would get one with a supercharger from the factory and ad a locker then get one with a factory locker and add a super charger, i also wouldn't buy another persons supercharger add-on, it would have to be a factory equipped supercharger. if you want to add a super charger yourself it's between 1.5K-3K depending how you go about it , you might get luck and see a set-up for 500-800 though, i've seen a few on craigslist,
also no facts to back this up but, i'd be more wary of a higher miles truck with a supper charger as opposed without. that's just me though.
personally i think it would be easier to add a a locker then a super charger for various reasons.
the fact your asking how helpful is a locker and don;t seem to really know what they are for or do, i don't think you really need one, and this isn;t a knock or a dis if your a homie, i'm just saying that if you don;t know what they are used for you most likely have never found yourself in a situation where you would need one (yet)
with that said no one can tell you or knows what you do where you go and how you drive your vehicle, that said i don't use mine very often at all if ever but i used to do alot of that sort of thing and may get the whim, i'm a big fan of the boy scout motto of always being prepared, so personally for me, it's better to have it and not need it then to need it and not to have it,
good luck on your search man and post up some pics when you drag one home!
