I think I understand your question...
You want to level a pure farming class to 70, so you can later level a warrior to 70? Thats not really a 'twink' but anyways...
Yeah rogues can farm tons of gold/hour solo'ing chests in mech
Hunters can also solo certain chests, but it takes more creativity -
hunter solos chests in heroic slave pens Of course it doesn't work for a hunter if they're locked...
I'd say for a pure farming class that will later fund your tank, go with a hunter. They level fastest, solo easiest, and farm faster then rogues. Sure rogues can use stealth tricks to solo chests in mech, but hunters can do more imo. Half the chests will be locked in heroic slave pens, but you can average almost 1 per run in heroic SP, and you grind alot faster outside of chest farming.
Warlocks are good too, maybe mages. But mages rely on mana too much, I wouldn't really recommend them. Feral druids can solo pretty quick in cat form at level 20+, but I think hunter, warlock or rogue would be your best farming class.
You will want blacksmithing on your warrior, so I'd take mining on both toons. It will make lots of gold for your hunter, and you'll be able to mine more stuff for your warrior to keep his blacksmithing up to date. You could also do the disenchanting thing if you wanna sit at the AH for an hour a day (many threads here). I'd go jewelcrafting/mining, or mining/skinning to make lots of gold on your hunter. Then get an epic flyer, and you'll be able to fund your warrior. Lots of people have pure farming classes to fund their tanks...because tanks suck at grinding lol.
Edited, Sep 3rd 2007 3:39pm by mikelolol