You cannot dupe them, you cannot own the hotknife or carbon rs unless you have CE / SE copy of gta5.
The Roosevelt cannot be stored if somebody brought you one from singleplayer, leaving only one option for this:
Take a look in modded lobbies for a recovery service. Someone with the right modded console & mods can sign in as you & buy one, whereas you cannot buy it yourself. You'd need the money for one.
Hi guys, I was wondering if anyone could possibly dupe me a fully modified Buffalo S or a fully modified Panto for my second character? In return I can give you a Adder, Entity, Jester, etc on my first character. I am on PlayStation. If anyone could reply to this and help me out please.