You CAN have multiple Gamertags, But if you use them all on the SAME xbox you have to "reload" them everytime, it's just a big hassle. You can only use the Trial ONCE on any system. So if i used my 2 month trial i can't give it to someone else to use. Cruciform they have and will ban Gamertags along with whole consoles (from the serial numbers you Have to enter in when you sign up for a new account).
As far as being able to give you a 2 month trial code, good luck thier all expired right now (as far as i'm aware) Wait for the next big game (probably Halo2) and they will release new Trial memberships. If not it's only 50.00 for a year why not do that.
1.2 Bearded dragons (Login, Raven, & Jean Grey) 1.1.1 Corn snakes(Havoc,Sable, & Kink0 1.5 Leo's (Psyloke (Lucky-male) Speedball, Domino, Rouge, Siren, Elektra) 1.0 Veiled Chams (Neo), 0.1 Rose Hair T. (Night Crawler) 0.0.3 Crested Geckos (Shiva, Storm, Beast) 0.2 Kenyan Sand Boas (Tigra & Cloak)